I received my 1st order from Gremlin DIY yesterday. I'm definitely impressed that I ordered on Friday before the holiday weekend, and it arrived yesterday, the day after the Federal holiday. Very fast processing. My flavors were well packaged in bubble wrap, with no leaks or drips of any kind. Nice job. They even included a sticker! Though, maybe next time leave it on the backing film, rather than sticking it to the inside of the box. That way I can stick it on the outside of my vape gear for some free advertising.
Edit: I also like that they have 5mL sizes, AND they come in squeeze bottles. This is great for working on new recipes, where you may not be totally sure if the flavors you're ordering are exactly what you're looking for. Probably less important to mixers that already have a large stash of flavors, but it helps ME.