I have an Mamiya RZ67 with 4 lenses. I am more than satisfied with the quality of the camera and all the lenses.
I do not use it. I much prefer using my Contax RTSIII with any of the 9 lenses I have for it, all primes..8 Zeiss and 1 Leica.
For me, generally speaking, I much prefer and mostly recommend sticking with cameras that I know will be used as opposed to being paperweights.
When I am sitting and afflicted with gas, I lift one cheek from the chair and then I feel better again.