I liked the Vista/Sunstar in 2004-2005, I thought it was a nice size and more useful than the Rialta alternative. My wife considered it too small, so we ended up with a much larger C.
The one person I know who has the VW-based Sunstar, likes it and uses it regularly.
You might investigate where you'll take it for chassis service. Many VW dealers do not have lifts, sometimes not even shop bays, large enough for this vehicle. Chassis parts stock can also be "iffy" because VW of America only briefly imported the T4 passenger van, which turned out to be not competitive in the "large minivan" market at which it was targeted, and the commercial T4 van was crippled on the market here by a punitive import tariff.
The "house" build is at the same materials level, same construction methods, as contemporary Winnebago Chalet, Minnie or Spirit.