Exactly what daleron and ocelot said, you have to try one, that said, I have purchased seven over the last month and they are excellent! One is with me all the time, one on the Vamo at my desk, one in the vehicle, well, you get the point. I used vivi novas for a couple of months and there is no comparison with the pro tanks that I purchased, no leaks, great vape, the option to use evod coils or pro tank coils all are benefits. If you like a "airy vape", you can't go wrong, imho....Good luck to you, be safe!