Just got my tank system for my eGo last night. Amazing! Hasn't leaked a drop, big vapor and flavor, absolutely love it. Just screw on the cone type atty, pop off the little cover on the the tank/cart, fill it leaving a little space (used the 30ml bottles, wyatt earp and one applewood) snap the cap back on push the tank/cart down on the atty till it clicks in (have to push kinda hard) and vape away! The wyatt earp ran out about 15 min ago, snapped in a applewood and it's going strong! Well worth the money. I got 2 attys and a pack of 5 tanks. If you're an eGo fan you've got to do it!! The biggest thing I like about it is the cleanliness, no more messy, leaky carts. i figure i could prefill 2 tanks and have about a day and a half heavy vaping on them... Very cool.
(I can see how the caps of the tank could be hard to pop off for some people though, and a syringe would make refilling easier for those folks)