My experiences are limited to just two: the Kanger T2 and the Vision V3 (a lower capacity, maybe 1.6ml clearo). I'm not really wild about the Vision as I've experienced some leakage. I'm pretty well settled with the T2, once some really annoying mouthpiece cracking/leaking problems were resolved by a redesigned version. It delivers nicely and holds up well. I just did my first successful T2 coil rebuild this past weekend. (Great feeling, isn't it?)