I don't have one but when I was looking for what I would want, Sportsmobile was on top of my list. I went to the Indiana facility which I believe is the smallest one of the three and spoke to the people and viewed their work. My conclusion is all the parts "refrigerator, toilet, gennerator, etc) are all bought and can be in many other vans so the quality isn't going to be better at a certain mfg. than the other. How it is put together can make a differance as well as the quality and duribility of some basic materials. From what I saw I don't think that is an issue as I believe most have a very good standard of quality. The chassie is all the same so that won't matter from one to the other bringing it down to floorplan and price.
One other factor when I was looking. many of the Bs were actually B+ and I think all of Sportsmobiles were straight Bs. I like the stealty appearance of a straight B. I'll also mention they were the first ones to make a 4X4 available too. I ended up buying a used Coachman because I couldn't pass on the deal I had going, but when my ship comes in I just may be calling Sportsmobile back.