I have been looking around at different shops and websites and think that it is crazy all of the knocking off of the knock off that are an issue in the e-cig world. I am currently in the market to get three good toppers for my sigelei zmax and a Kanger Protank 2 is one of them. But i am seeing "Protank 2's" everywhere without seeing KangerTech on the boxes anywhere. Just makes me sick. I want to get real product at the best price without buying a crappy knock off. Also would like a good carto-tank and atomizer (for dripping)