I own both a vivi nova and kanger protank. I love them both. To me, they are much different. The protank has a nice airy draw, whereas, the vivi nova has a nice tight draw. I set me nova up with a mini sphere glass tip. Once I did that, I found the sweet spot. I like them both. I run both on my vamo v2. I have found the protank has a cooler vapor because the coil is at the bottom of the tank. The nova is a bit warmer because the coil is at the top. I would reccommend both. The only downside to the protank is the top tip is one solid piece. You can't use other drip tips, but the tip that comes on the protank is nice. Nice shape, clean look. I have seen on other threads techniques others have used to tighten the draw on the protank. I decided to keep it as is, with mods because I have my nova that offers a tighter draw. Like I said, I enjoy both. You can re-wick and re-coil both atty's easily. In my opinion, these 2 tanks are the best clearomizers on the market right now, remember, this is my opinion. Hope this helps.