Sheer cost kept me away from the Rolleis when they were available new on the market. I thought they were magnificent cameras, and they probably are. Beside the fact that they are not nearly as common as Hasselblads, the age factor has to be a consideration. They've been off the market new for a long time. I'd be concerned about parts and maintenance, although that appears not to be a big problem - owners talk about being able to get them fixed without much of a problem.
I own a Hasselblad and three lenses, and love using it. My only problem is not owning all the lenses. If I did own all the lenses, I'd not be able to carry my kit.