Overall, it's a good atty, but really needs a better seal on the positive pin. I plugged the center air holes on the bottom for better back pressure, works well in that config. The dummy notch for the top air pipes is annoying, I think most RDA users can get the air over the coils. The other problem I had was the drip tip being fused to the top, so no 510 drip tip for me, but that's this unit, probably isolated.

This might get a 5 star rating without the center pin leakage, but it may well be a common problem to the velocity style deck. (with provided coils, rolling clouds at 75w running peg) It's overall function is good, but quality control seems inconsistent.