I had unhappy experiences with the eGo-T type B tanks, even with the softie bottoms. The problem for me was always having to carry a paper towel and a bent paper clip to clean out the thing after I would inadvertently draw too hard on it. It's my fault entirely -- during the heat of conversation, sometimes I would revert to a hard cigarette draw and flood the passageways. It's not easy popping out the two little plastic thingies then mopping out the passageways in the dim light of a tavern and with half a buzz on! It's amazing how far those little plastic thingies can fly if you don't drape a bar napkin over your hand during the extraction process. So I gave up on the eGo-T tanks.
Since then, I've switched to echo-e carts. They hold a LOT of eliquid (easily 2.5 ml.), they're easy to top off using the drip-down-the-sides method, they're easy to clean with a syringe and isopropyl alcohol, and they seem nearly bulletproof (I haven't pitched one of them yet, after a couple of months of rotating ten of them).
The only fussy aspect of the echo-e carts is that it takes a while to fill them, especially with the VG-heavy eliquids I favor. You just have to be patient: drip 10-15 drops down the sides, then go do something else for a while, return to drip another 10-15 drops, repeat. It takes an hour or more to completely fill to saturation one of these, either brand-new or cleaned and thoroughly dried (I let mine dry for a full week after cleaning with alcohol). If one goes dryish, I'll top it off with 6-10 drops in one session, then let it sit for a while before vaping it.
