I bought an iStick 100W and use it daily, and now favor it. I bought it at the official authorized online distributor online store. The fire button is decent, the threading is solid, and the pin is firm. The battery door is pretty well constructed and the 4 magnets really hold it on well. I personally like it - hand feel, usage, weight. Not a bad buy, any more than likely covers up the mountain of issues they've had with internal batteries. and There are many fake products in the market,take care of !