The earlier posters provided pretty accurate responses. Sportsmobile conversions are mostly about function rather than glitz. The furnishings in our 2006 Sportsmobile with 106,000 miles are still solid.
There is another factor that you should consider. B vans have limited space. Road Trek, Pleasureway, etc. each make only a few different layouts intended that are intended to fit "average" customers. They may include features that you don't need and lack features that you want.
Sportsmobile allows you to design your own floor plan so you only get the features you need and don't waste space on features that you won't use.