My local shop had these come in the other day, and I picked one up as an impulse buy. I normally go with rebuildables, but I like having a tank that does premade coils because life, uh, finds a way. I've put about half a dozen tanks worth through it so far.
Set to wide open, this is a lung hitter's dream come true, especially with the stock drip tip. I tend to have it about 1/3rd open, as I prefer a tighter, restricted lung hit style. I've only used the .4 ohm coil and keep it around 44 watts. No problems wicking high VG juice, top fill is nice and easy, haven't had any leaking thus far. Keeps up at at higher wattages as well, I took it up to 55 just for funnsies and it worked well, though hotter than I prefer unless I open the air flow up more.
I do not like the way they did the drip tip, but I prefer smaller diameter drip tips in general. I'll be digging through my spares to find one that lines up nicely with the top, for aesthetic reasons. Swapping coils will need to happen with an empty tank, otherwise it looks like leak city (note: have not tested this out, just going off what I can see). If this was my only tank, or if it was a higher resistance coil and didn't go through juice as quickly, it would be more of an issue. As it stands now, it's not a deal breaker for me. If/when the RTA section comes out, I'll just hope it is easy to get the wicking right so I won't have to futz with it too much
Overall build quality is quite nice, threads are all smooth and removing the top cap for filling is nice and easy. For the price (I think I paid about $30) I am happy with it. If any one has questions about it, feel free to ask me and I'll do my best to answer them