I never had any trouble with my eGo-T leaking (unless, of course, I chewed on the mouthpiece). However, I'm not sure if I would have kept vaping if I hadn't moved on to something with more TH.
Recently, I have re-visited my eGo-T atties and find that they're great, but only on a Twist so I can add a few more volts.
One comment, this doesn't seem to be Joye brand. I've gotten the impression that some of the knock-offs have more leaking problems. Hopefully, someone here has tried them and can chime in with that info.
ETA: I think that it would be a better idea to start with Twist batteries. That way you can better experiment with different atties, clearos, and cartos. Also, if you want to try an ego tank system, the eGo-C would be a better bet (and cheaper to keep running).