A few years back I owned a Mamiya 6 medium format rangefinder. Eventually I drifted toward using the Hasselblads for medium format and sold the Mamiya. I've been missing it.
Carrying a Hasselblad around "just in case" doesn't make a lot of sense. I love them, but they're definitely not convenient. If I want convenience and medium format, the Mamiya 6 is about the best there is.
I'm thinking about trying one again. After all, with a self timer I can make silly things like the above photo :).