I've been at it for about 2 months using my V2 (kr808d-1) batteries, and Greensmoke (kr808d-2) batteries , refilling my cartos with various juices from various vendors and have been pretty happy with it. Just have to be sure to carry my pcc with me everywhere so I always have a fresh battery. I've bought some clearos and I don't like them, they all leak so bad. So keep going back to the cartos/ refilling, using the spin method. So, I'm confused, I was wanting to upgrade, but now I'm thinking tank systems are no good, and clearos are the way to go? Again , maybe I just got crappy clearos but they don't do anything for me except make a mess Please help! thanks all