I finally found a good RTA that doesn't leak, at all, has top airflow, dual coil, and the flavor is still good out of it. This one hit all those spots for me. The two piece bottom put me off at first but it's not been a problem at all with leaking.
Two things I wish were better. Screwing the bottom on is pretty finicky at best. Have to be careful not to cross thread it, not a major issue but an annoyance. The only other dislike I can come up with is the top fill. While I love the quarter turn "unscrew" I do not like the size of the actual fill port. Too small for a twist top bottle, it's workable just another annoyance.
Other than that - I've been vaping on this for almost a week straight and haven't had a single drop of juice anywhere. I'm so happy. ;-)