I absolutely love this RTA. i am not a coil building pro. I use Kanthal micro coils. vape at .5 ohms at about 35-40 watts. Love this tank. Replacing cotton is a beaze even with a full tank of juice. building coils are easy on the kensei build deck. I have not had any spit back. I've been using fiber freaks cotton and i cut one piece in half for a perfect fit. Build quality is superb. everything is smooth and feels of good quality. changing the glass was easy. No leaking issues. Love the juice flow control. love the air flow.