I tried a couple of different e-cigs until the spring of 2011 when I tried a Go Go. I've never really wanted to try anything else since. I'm not into mods and fussing with them ... I just want EASY and WORKS! The Go Go still does it for me. I've had a few dud batteries but once you get two or three good ones, in my experience they last 6 to 9 months. I vape about 2 MG a day on average and charge the batteries every other day for about 2 1/2 to 3 1/2 hours. I've found my all day flavor so I have 2 cartos which I top off 3 or 4 times a day. Each carto lasts me one to two weeks then I toss them. Easy!!!!!
PS It still took me about 6 months of vaping before I quit the cigs. But I don't even really miss them now. AND I thought I'd NEVER be able to quit since I'd tried all the "official methods" and failed!!!!