The iStick 50w
performs excellently. Very ergonomic and fits great in the hand. The size is surprisingly small because it's only a little bigger than two 18650s. I was shocked when I opened the box. Feels solid, as it's screwed together, with a nice weight to it. The battery life is excellent with the built-in parallel 18650's. I received it fully charged from the factory and vaped it for 2 1/2 days at 30w before it received its first charge, I go through 6-7 ml a day. I vape it with Aspire Nautilus Mini Tank, really marvelous vaping experience and tasteful flavor.