Received mine just now and threw a quick single coil build on. Here are my early observations:
-very tight build space; no more than 2.5mm id coil
-thing leaks like a sieve when top refilling even with airflow closed
-airflow pretty restrictive due to the airflow being partially blocked by your coil
-flavor decent
Not quite happy with this tank so far, especially after it was billed as leak proof.
Gonna play around with it with different build and wicking to see if I can get it to not leak during refills. No juice flow control and topfill so far seems like a big mistake by ud so far
Been using mine for about 3 weeks. The leaking issue when you will it means you're not using enough cotton. You need THICK cotton tails - thick as in, you struggle to pull them thru the coil. And they need to be short enough to just sit under the little shelf lip.
I know, this thing is tricky. But it's tricky because it has massive juice channels. Which is a good thing for us that use 90% VG juice. Once you figure it out, it's a dream. This tank is all I've used since I got it last month. Such a fantastic tank.