I use an eGo also. Just the normal one at present, but it did come with the T batteries, and I love them. Just ordered more t-batts and, among other things, some t-atty's and tanks from GH1. Will probably be at least a couple weeks 'till they get here, but will be interesting to play around with them and see if they work and are worth the trouble. If not, I figure I can always use them for backups if I'm ever in dire straights waiting on an order or backlog or something
Also have some bridgeless LR atty's coming. That's probably what I'm most excited to try
Let us know how you like the t setup if you do try it.
Maximillian the Vaguely Disreputable