Joyetech Espion mod with ProCore X tank review by Mjag. Good or blah?

Sometimes you get a surprise delivery, it can be good or bad. I did not know Joyetech had sent me the Espion mod with ProCore X kit until it showed up…let’s find out if this is one of those good or bad surprises.

What you get

  • Espion mod
  • ProCore X tank
  • ProC1 (0.4ohm) head preinstalled
  • ProC1-S (0.25ohm) head
  • Spare glass for 4.5ml
  • Extended vent pipe for 4.5ml
  • USB cable
  • Manual
  • Warranty card
  • Warning card
  • Spare o’rings

Available in 3 colors


  • Mod size: 44mm(L)*28mm(W)*83mm(H)
  • Screen type: 1.45 inch TFT color screen
  • Screen resolution: 240*320 dpi
  • Output wattage: 1-200W
  • Output mode: Power/RTC/TC(Ni, Ti, SS316)/TCR modes
  • Resistance range: 0.05-1.5ohm for TC/TCR mode
    0.1-3.5ohm for Power mode
  • Temperature range: 100-315°C/ 200-600°F
  • Battery using: Dual replaceable high rate 18650 cells (CDC25A)
  • Max charging current: 2.0A
  • Max output current: 50A
  • Max output voltage: 9V

ProCore X

The ProCore X is a pretty basic tank, I really would have liked to see a nicer looking tank that would better match the slick looks of the Espion.

In 4.5ml mode on the Espion

It comes out of the box in 2ml mode but is expandable to 4.5ml with the included chimney extension and larger glass.

Broken down with 2 coils included in packaging, 2 glass sizes, chimney extension and spare o’rings.

2ml mode

4.5ml mode

I started my testing with the ProC1 0.4ohm coil in 2ml mode. It has a wattage rating of 40 to 80 watts but it is said to be best between 55 and 65 watts. If your a chain vaper like me then 65 watts would be too much, I got dry hits on my third pull. At 55 watts it was a lot better but on extended vape sessions I could still get a dry hit, lowering it to between 45 and 50 watts was better in my chain vaping sessions.

Flavor right off the bat was impressive, after the first day I was already looking for sites to order more coils. The flavor really came through and I was impressed, not a cloud beast but you would be looking at different tanks for that anyway, this is more for the flavor chasers.

The 2ml capacity makes fillups an all day affair, it got old after the first day so on went the 4.5ml chimney extension and larger glass. I wasn’t expecting much loss in flavor but must admit it was not as tasty as the 2ml setup. Still good but a little was lost, I would definitely recommend keeping it in 2ml mode for the best in flavor, too bad there wasn’t a bubble glass option to keep the height the same but increase capacity.

Coil life wasn’t as good as I was hoping for, 10 days is not bad but I have tanks with coils that last me twice as long, 10 days for me is not great so that is a con.

Switching to the ProC1-S 0.25ohm MTL coil was a must, I am normally not a big MTL fan but this coil is more of a restrictive lung hit and I found it enjoyable. The wattage rating is 25 to 55 watts with a recommended range of 30 to 40 watts. 55 watts is just to hot for this coil unless you like the taste of singed cotton. I found for chain vaping 25 to 30 watts to be where I liked it, any higher and I could run into dry hits. It is a cloudy bastard for what is supposed to be a MTL coil, even with the airflow barely open and at 20 watts I could still get a decent cloud going.

Flavor on the ProC1-S MTL coil was good but a little lacking for me compared to the ProC1 0.4ohm coil which surprised me a little. Could just be my preference to more airflow but there was a definite difference in the flavor I got using the same juice. They were both tested in 2ml and 4.5ml configs as well but the 2ml ProC1 was the flavor combo for me.

The drip tip is more of a drip cover, much like the Aspire Cleito. I do not have an original Cleito to see if that drip cover would fit but do have a Cleito EXO but the cover from that tank is too big. You can remove the cover and some 510 drip tips will fit, usually the ones with dual o’rings but it looks funny with the exposed o’rings. Overall the included drip cover is fine, comfortable enough and not too big or small.

Overall the ProCore X is a good tank with great flavor in 2ml mode with the ProC1 coil. Looks are plain though, not really my cup of tea but maybe it’s yours?

Espion mod

Right out of the box I was impressed with how small this mod was for a dual 18650. Not only that but the build quality and looks had me grinning from ear to ear. Then I put in a pair of batteries…ohhhhhhh, that screen, me likey.

Check out the screen comparison with the SXmini G Class, the Espion screen is bigger and easier to read as the fonts are bigger as well, I love this screen!

The menu is pretty easy to navigate once you get use to it, 3 clicks of the fire button to get into the menu, use the up/down button to navigate and then use the mode button to select. I do admit that sometimes I would forget and use the fire button to select like you do on a lot of other mods, hitting the fire button just takes you out of the menu your on. Joyetech made a nice little video to explain the operation so I am posting it here for those who want to check it out:

While being one of the smallest dual battery mods on the market it still accommodates a 28mm tank with no overhang.

30mm tanks don’t look bad if you can deal with 1mm overhang on the front and back.

Of course 24mm tanks will look just fine, love that they centered the 510.

That’s all sexy and what not but does it put out?

Yep, and then some. The Espion has been a joy to use in the month I have had it in both power and TC modes. It even has a RTC mode but that just means Real Time Clock which you can select either a digital or analog clock to be on the main screen as you vape. Even in just power mode you still get the time, it is in the top left corner.

Power mode left nothing to be desired and they even include a preheat if you so choose to use it. I did try the preheat which is user set, you choose the power of the preheat and well as the duration. I do like preheat but am not crazy about the set versions, I prefer the percentage based on the power you have set like Yihi and Smoant does it. If I am vaping at 75 watts with the Espion I have to go in and adjust my preheat, if I want it to fire at 95 watts for a half second then that is what I do. If I then change to a low wattage tank and set my main watts to 40 watts I better not forget to change my preheat, if not then I will get 95 watts for a half second. I actually did do this a few times, after awhile I just turned the duration of the preheat to 0 seconds which nullifies it.

Even without the preheat this mod fires up instantly. I know Voopoo talks about how fast there mods fire and I have a drag and like it. I put the same tank on both the Espion and Voopoo Drag and the Espion is just as fast, dare I say it, it felt a little faster. That is the one thing that kept amazing me about the Espion, how quickly it fired up and why I feel the preheat is not even necessary unless you have some huge gnarly coils. Very impressive power performance from the Espion and all the way up to 200 watts I never felt like it was lacking, this one is a winner.

TC performance was also very good…most of the time. I did have some occasions were it just didn’t like some huge SS316L builds like the dual SS Aliens in my Aromamizer Plus which ohm out at 0.10. It would work sometimes but then other times it would kick me out of TC and back into power mode. I also had a few times when it didn’t want to get the resistance right, kept the resistance from the previous tanks. This would mainly happen with low TC builds even though Joyetech lists a low of 0.05 for TC it definitely gets finicky when you get to 0.12 or less.
Aside from that though the TC performance was excellent, one of the better TC mods I have tested in it’s price range. Combine that with it’s excellent power mode performance and Joyetech really did a great job with the Espion, I love using it.

One thing to note is sometimes even in power mode it will retain the ohms from the last tank. I found that just unscrewing the new tank, hitting the power button so that it says “no atomizer” then screwing the new tank back on will clear that up. Doesn’t happen all the time but has happened to me a handful of times in a month.

The fire button does have some play, I can tap it lightly and get some clickity click action going. It doesn’t bother me much and shaking the mod does elicit any odd noises. I know it will get some peoples OCD to flare up though and it must be mentioned, just a small oversight on Joyetech’s part from an otherwise solidly built mod.

Battery life has been pretty good, it doesn’t have a puff counter so just going off of experience. It does have 2 amp internal charging so even on the go you can charge up quick.

Battery door has been solid and easy to use, no complaints there.

The 510 has been solid with good travel and all my tanks have sit flush.

It is mounted from underneath so no chance of 510 popping off and chucking you tank to the floor.

Size comparisons

I really am impressed with how Joyetech was able to make such a small dual battery mod and keep the 510 centered. I decided to round up some of my smaller dual 18650 mods so I can show you how small the Espion really is.

Shorter than the Alien and the same height as the Dovpo Trigger 168.

The Battlestar is the same height and a little more comfortable to hold. The Cylon in bigger and taller but also accommodates 30mm tanks as opposed to the Espion’s 28mm limit.

Smaller than both the Fuchai Duo 3 and Modefined Sirius.

Feeling a little dwarfed by the VapeCige Creator and G Class.


  • Great flavor from ProCore X tank with ProC1 coil in 2ml mode
  • 2ml and 4.5ml options
  • One of the smallest dual 18650 mods on the market
  • Excellent power mode performance with noticeably fast firing
  • Preheat mode
  • Excellent TC performance with builds higher than 0.12ohms
  • Solid construction on the Espion mod aside from the loose power button
  • Beautiful, big and easy to read color screen
  • Intuitive menu system


  • Coil life could be better
  • Drip tip not replacable
  • ProCore X tank is rather dull looking compared to the sexy Espion mod
  • Too much play on the fire button
  • Can have problem running builds 0.12ohms and below in TC
  • Will not read the ohms of new tanks on occasion, need to remove new tank, hit fire button and then put back on

Final thoughts

As you probably have figured out by now I love the Espion mod, while it does have some cons what it does get right is ohhhh so right. From the beautiful and well thought out color screen, easy menu system, solid construction and flat out great performance the Espion is a winner and I have no doubts you will love it too.

The ProCore X tank feels like an afterthought, I really wish they designed another tank to go with the Espion and they don’t really look good together. the ProCore X feels like it should be included in a starter kit, not with the Espion.
The ProCore X performance in 2ml mode with the ProC1 coil is a legit flavor tank, not as much when you use the 4.5ml extension. Overall it is a good tank, just not great like the Espion to warrant it’s inclusion into this kit.

If you are looking for a deal then one place you should check is this site: Of course a google search might yield some great results as well.

Thank you for checking out my review and thanks for Joyetech for sending me the Espion kit for review, it was an excellent surprise. You can find more info here:

Check out how this stacks up to other tasty vape gear and meet the Steampugs team of reviewers. Your bound to have a good time and read up on some great products, not so great ones too


Great review as always. 510 pin connection looks nice since seems to be a common problem. I love that u match it up w/ diff devices for size comparisons, save my ruler to measure other things in mm.


I did get a lot of comments about how small it is…I mean the mod…sniff sniff. I am glad you liked the size comparisons, helps to put it in perspective.

Thanks for taking a look, much appreciated :+1:


That’s a sleek looking mod! Shame about the tank…it just looks ‘plain and a bit cheap’ - which would be fine if it performed like the best.

Awesome review beaut, and as always I :heart_decoration: the comparison photos!


Yeah, they could have made a better effort on the tank for sure.

Thank you my sweet :kissing_heart:

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Yet another awesome review! I love when people tear stuff apart! I would lose all the screws. The 510 looks like its secured really well.Thanks again!


Excellent review once again!

And the quote set off a lightbulb in my head. I never got the deal with bubble tanks other than they held more juice. Thanks for helping my dense brain.

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I’ve wondered for quite a while now if these are just glitches that are intrinsic with Joyetech. As both my Ekee and Cuboid have the same issues.

Until recently, I wasn’t sure whether it’s due to chipset, or firmware. Or some combination of the two.

Currently, I’m inclined to believe that it’s almost got to be chipset (or architecture) related. Because I’ve been running ArcticFox on my Cuboid 150w for the last few months, and I still am experiencing issues with “mode swaps”. Only now, it’s not from TC to power. It’s from power (preset #1) to being off for awhile…then I come back, and find it’s in preset #2 (TC).*

I’ve also experienced issues with the impedance staying steady (over duration).

EG: Fresh, and brand new coil is installed, and let’s say it reads .20 to start. It sometimes climbs up to as high as .24 (over typically two or three days), before something inside ‘snaps’ and it goes back to the “expected normal increase” of .01 or .02 (due to build up of consumed liquid aka: gunk) to settle in at a .21 or .22 reading.

*Both of these situations persist, even after changing to ArcticFox (on the Cuboid). So I’m more inclined to think it’s a defect in the hardware. However. I don’t know if

  1. The same chipset is used across all these mods (nor am I going to assume that)
  2. ArcticFox was written from the ground up, or, did they heavily borrow, and just modify code as desired. (Perhaps somehow the line(s) of code responsible for the observed issues remain intact within ArcticFox?)

It’s very interesting nonetheless.

Also, FWIW, the 2a charging on the Ekee is highly over powered for that particular design. That mod gets WAY TOO HOT for comfort while charging. And while the temp protection (while charging, not to be confused with TC temp protect) does work and kicks in when the board/chassis gets hot, IMO, it should kick in much sooner. But then, that would mean the charging cycle would take even longer, and as a result, would somewhat negate the benefit of having 2a charging.

(Still reading your review, so I’ll be anxious to see how the 2a charging fared with you, but wanted to comment while I was thinking about it all)

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Ok… Done reading and perusing the pics!

Great review, and love the gut-shots! :thumbsup:

Looks like they used the same damned stand-off idea as what they did in the Cuboid (which is a crappy implementation IMO). On the plus side though, they definitely changed the supplier of the fire switch on said stand-off. So here’s hoping there’s no fire button issues!

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Ty for great review

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Regulated devices and tanks isn’t anything that i personally is interested in but i do despite that enjoy reading your well written reviews @mjag . Just keep up the good work and keep them coming :+1:

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Awesome review brother as always
:+1: and fucking awesome mod, really well made , gonna do mine next week I think :wink::+1: thanks for your work dude :wink::ok_hand: great to have you in the team :grin:


Thanks @Jim22, it is always fun to peak inside a mod :+1:

@TheTinMan this is the first tank that the bubble glass made sense to me, wasn’t expecting to notice a difference between the 2 and 4.5ml options. Made more sense when I thought about it, in 2ml mode the coils are about as close as you would have them in an RDA.

@Sprkslfly I do worry about Joyetech/Wismec products, more so with Wismec, too many problems with that brand but I always try and keep an open mind and not let past issues cloud my judgement. I am hoping the Espion continues to work like it has for the past month, that would be great. I know the Joyetech eVic-VTC mini I gave to my ex is still working and trust me, that woman can destroy anything. I have had more luck with Joyetech over Wismec products even though they are under the same parent company.
I did not mention the charging in my review, I usually don’t unless I discover a problem or there is a special function to it. I did test it though and the mod just got warm but not hot when using a 2A charger.
I did go and read a few reviews on the Espion after finishing mine and it looks like the TC problems I encountered is the norm, at least with the 2 reviews I read from reviewers who favor TC. I am vaping my Espion with a dual SS316L triple core fused clapton build @ 0.20ohms in an RDA as I write this and it is still a great vape, comparable to my Yihi and DNA mods. I only had problems with builds under 0.15 but read others had problems with other builds. Going off of that I would have to say it is not the most consistent TC mod but the builds that work for me work great in TC. Sorry for the long paragraph, trying to keep it together as I am responding to all in one post…lol. Thanks for the well thought out and informative post bud!

Thank you @redscaddy22 :+1:

Thank you @Norseman, much appreciated :+1:

Thanks @Steampugs and thank you for having me on the team, I really appreciate all you do for us, well you and @Lolly, lets be honest, you would be a lost dog without her :grin: Looking forward to your review on it :+1:


Ain’t that the truth brother :rofl::+1::wink:


Awesome review, Mjag! I love love love the looks of that mod! That screen! :heart_eyes:
And once again, fuckin love the tear-downs you do! :tada:

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Thank you VM, it is a nice mod for sure, still in my line up and gonna check out the other colors at the ECC show in a few weeks and possibly pick up another one. The screen is awesome and so clear and it is just so compact for dual batteries.

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I added the gunmetal Espion a few weeks ago but today went to use it in TC and got very choppy results. My black review sample was great in TC most of the time but this new one is just off. Wish I still had my black one but gave it to a friend when I got the gunmetal…sigh. It sure is good looking though, hopefully I can figure out why TC is out of whack, maybe it has a different firmware?


Definitely appreciate the update bud!
I really like the looks of it.

You’re probably nail on the head. But as with all engineering samples… Hardware (chips etc) are always subject to availability when it comes to production time. Hard to say.

Here’s hoping a simple F/W update solves it!


Yeah bud, had to update the review thread on what is happening now. I like the looks of it too and really small with a great finish, all around nice mod that as can be seen is still being used after my review.

I just checked there website and no FW updates, same as what is already on the mod. I did hear a friend say that Arctic Fox is working on a firmware so there is hope.

I am also noticing the first initial press of the fire button there is a little delay, not the case with the black sample version I reviewed. After the first hit then it is quicker and this is with a dual 26g single wire build, not some huge aliens or anything. The build comes in at 0.25 ohms and generally works great in TC so it just bugs me. Gonna have to put this to the side for now and get back to it later.


Arctic Fox just released there new Red Panda build for color screens, Wismec Sinuous Ravage230 and Joyetech ESPION support.

I still have to figure out how to switch from C to F but aside from that it is pretty good thus far.