I've seen some good things about them. you might want to check out reviews at you tube. To be honest, I'm not ready to deal with variable voltage units. I'm currently using a stick myself, but just ordered the E-power, like I said above. the idea of dealing with different cartos with different ohms, different tanks, etc. quite frankly is more than I want to face for a while, lol. I'll stick to my standard 3.7 volt E-power with the 1.7 ohm Resurrector cartos.
