I went from an Ego, to a 16650 Evic Easy Head (just the regulated control head, 3.7v, no screen), and I now have an MVP 2 and I'm loving it. I thought a box mod would be weird, but it actually feels nice in the hand and has crazy good battery life (2600 mah). It's VV/VW from 3.3v - 5v, and from 6w - 11w. It seems well built, compared to the evic which I've heard has a bit less than decent build quality. It's also a bit cheaper than an evic (you can get from 101vape for around 40-50 bucks, kit comes with the MVP, beauty ring, iClear 30, and charging cable). I use mine with clearos, and it vapes great. I'm sure every delivery device would work fine on it with the exception of rebuildables.
Edit: It also has a resistance checker, which might come in handy if you're into rebuilding clearo heads.