I'm using an eGo mega carto right now. The best I can say is it's ok, and that's stretching a bit. I've filled it several times now and it just doesn't perform well until it gets hot, even then it's just ok. I won't be buying them again unless something is changed about them. I have some E2's coming tomorrow. I have seen many mixed reviews about them, so I'm not exactly sure what to expect. I'm still looking forward to trying them though, I'm a sucker for new stuff. Always looking for the ultimate be all end all vape. I have a feeling I'll still be looking after these get here tomorrow...lol If there was only a way to mod my cars exhaust pipe into a PV I'd be all set.