I am not much of a tank person but I do use one when on an all day outing. I gotta say that the Crown has the best flavor out of any sub ohm tank I have ever tried. I got rid of all my sub ohm tanks except for that one.
I hear the Crown v3 is just as good as the original and it is very nice too look at to boot. I actually want one and will probably wait for months and months before I get one. By then there will probably be a version 5.
As for mods... I have not bought one for quite some time now, @Whiterose0818 got me into building my own and I haven't looked back. You might consider one of his mods, not only will it last a lifetime but they are aesthetically pleasing also.