I just got mine in the mail. Paid $16.00 for 2 of them. First of all, I was annoyed that they come built in with a drip tip. (wanted to use my own pretty ones). Blew it out, screwed it on (my 1100 mah passthrough) and primed it. So I take a drag and expect to see these huge plumes of vapor that I was led to believe the 306 would provide. Not all that impressed. I mean...it's a nice atty and all but for the money, I'll stick with my 510, 3 hole dripping attys. Maybe it's better on a different device but it's supposed to work on the ego????? I must admit though....very good flavor!