I have one of epipemods (see on the left with eGo-T atty). I like it a lot. Yes, a little bit expensive but it is because it's hand made in USA. And the good thing is that the pipe itself will work for years (well, I hope). It contains only a replaceable button, 510/eGo connector and a replaceable battery. That's it. Nothing to fail. I used it with eGo Mega, eGo-T, eGo cartos, Echos, dual coil 510s, Giantomizers and more. All problems I had were with attys/cartomizers, not the pipe itself, so it was a great idea to allow to use any eGo/510 attys/cartomizers.