I bought the a Vapor King. Is this just a 501 rebranded? Also, mine has four holes which I think allows to much air in and makes the drag a little harsh, kind of like smoking a broken cigarette. Is this from the holes or is that normal? I have been using 18mg and 24mg cartomizers and they both behave the same way. Unfortunately, I got suckered by one of the e-cig tv commercials from Smoke Assist. It is a three piece set up. I have since stopped the automatic shipping. What I was wondering if there is a cart that would fit on their battery? I really liked everything about it, except the 0 nicotine and the crappy flavor. The drag was nice and smooth, (TH was minimal) and the vapor production was really good. I like the size and the battery life as well. I am thinking about getting some juice and trying to reuse one of the cartridges that came with it. Is this advisable?