The Phoenix is working as well in the
tank as it does in the stock tube. They
do not leak, which is amazing to me. All the other bottom coil cartos seemed to have serious leaking issues. Even after running almost a full 5ml of juice thru the tank, the connector is not wet. My CE2s, whether in a tank or not, always seem to flood and I always have to remove them from the device, blow it out, and dry the connector. Another thing is these do not have the condensation build up issues like with a CE2 (no mouthful of juice when you tip it).
I won't give a full review, there are plenty of them here already, especially since I've only used one in my tank so far. For a good review see LordDavon's review here:
My Phoenix Bottom Coil Video Review. One thing he states, which i have found to be the only thing I don't like about the Phoenix, is that they have a very cool vape. Right now I am trying to get used to that. I really want to like these, but I really miss the heat I get from the CE2s. I haven't had any dry hits and no flooding and gurgling. The flavor is good but different due to the coolness of the vapor.
I usually use an aluminum drip tip which can get pretty warm after a good chain vape on a CE2, these get warm at the base, and I kinda worry about what that heat might be doing to my battery.