Ok here is an update to my prior post. As far as leaking, my initial build didn't not have enough cotton so the juice was flooding the tank and coming out of the hole at the bottom. I rewicked the same build and really crammed some cotton in there, folding the cotton back over itself and I have had zero leaks.
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Hope this helps someone. The flavor is incredible and really puts out a surprising amount of vapor. 8-9 wraps of 28 gauge Kanthal @ 1.35 ohm.
Airflow is quite airy as others have said. I did put on the o-ring which helped a bit to tighten the draw but I find using my palm to cover the air holes slightly works even better!
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The in'ax I just couldn't get a proper build on so if anyone wants to take it off my hands, contact me. Only had two builds put in it.
Similar to your experience, I've settled on the UNO (for now). That's going on vacation with me (along with a couple of backup cartos, BVC's etc).
I've noticed one thing that's funny, and not particular to the UNO, but all builds. If a measure a build with an ohmmeter or a multimeter, say 2.3 ohm, when it's on the DNA 40, it invariably measures lower--in this case 1.8. This is measured cold, by the way. It drops further when it's hot, of course.
WRT to the In'ax, I've actually gotten it to work quite well, with the feed and coils. It took 6 builds to get there, but unfortunately the taste just isn't there. I'm vaping unflavored, which normally works on the gennies, but in this case I just can't get it to where I get that aaaaaaaaahh... taste. There's a Mistery on the way to me as well, and I hope I'll have better luck there. I really would like a leak-free gennie in a BB.
I hope it works so that I'll end up with the Mistery in my Kürbis and the UNO in my Rat Black. Man, I'm spending more on the RBAs than I am on the BB's themselves