I purchased one last week. So far it's been a mixed bag for me.
Flavor-wise, no other tank I have can touch it. It's amazing. It has better flavor then my Lemo/Lemo2, Aqua2, Kayfun 4's, Orchid....you name it. It spanks them all. Aiflow-wise, it's on par with the Lemo2. Fairly open for a tank, but perhaps a bit restrictive for someone used to doing wide open lung hits. I don't vape that way, so it has more airflow then I'll ever use. It's wicking ability is also amazing. I dare you to try and get a dry hit out of it.
Currently running spaced 27ga coils @ .45Ω total and running it at about 22 Watts on my iPV Mini2 and wicking them with cotton.
The problem I'm having is that it's been flooding the chamber when I fill it. I've tried different combinations of airflow open/closed, juice flow open/closed, and it still does it. I've watched a few reviews, and none mention that it leaks. In fact, they specifically mention how it doesn't leak. So I suspect I may have a seal issue. And when I'm ready for my next refill, I'm going to replace a couple of the o-rings. I believe two extra sets are included. (Don't quote me on that)
Assuming I can iron out the flooding-after-refill issue, it's only other downside for me is it's smallish capacity. My concern with it's capacity will vanish if the flooding issue ceases. It is extremely quick and easy to fill.
If I can't iron out the flooding issue, I'll ultimately stop using it. Awesome flavor or not, I don't like needlessly wasting e-liquid. But as I said, I think it's a problem with my unit, and hope to get it sorted. I really hope it works out, because it's such an awesome performer.