I just got my Kanger T3 bc clearomizer tank today. I am very very impressed so far. It is the bc clearomizer I've been looking for for a long time. It is a little longer than regular clearos and has a permanent tip, It has replaceable atty heads and fills from the bottom straight from the bottle. It produces a very clean tasting vapor and I can't get a dry hit no matter how many hits I take in a row. I've tried most all of the clearos and ce type tanks that have been on the market in the last year and this is the best I've tried right out of the box. It does have an ego type connection so you need an ego adapter to use with some APV's.
The only supplier I know that has them in stock so far is LiteCigUSA.
Kanger T3 EgO Bottom Coil Clearomizer Tank System