I'm still test driving it, but so far, it's been a great tank. It gurgles for a few minutes after filling it, but the gurgling stops pretty fast once you start vaping with it. I ordered some Ni200 coils that should be here in a couple of days. When they arrive, I plan to swap out the RTA section with a factory coil head and give it to him if it still performs well. I just want to make sure that it's a hassle-free tank before I do.