Hmm... it's a love relationship. I have the Mamiya 645 1000s which I got quite cheap (170 €) together with a 80mm f/1.9 lens off eBay in mint condition. It's a solid camera, mostly metal with quality plastic. The lens hoods look like a plumbers tool but I think I should use it, the lenses seem to lose more contrast without it than I'm used from the Canon EF lenses (less sophisticated coatings?).
It has some drawbacks though. It's one of the Mamiya 645 models which has no replaceable backs, so you can't rotate it for portrait format. With the waist level finder you're stuck at shooting horizontal. That makes me think I should have gone to a 6x6 like Hasselblad or a Rolleicord. I don't want to get a prism because I only bought it because I want to shoot wlf.
Also the 80 1.9 is difficult to focus (it behaves like ~ 50mm f/1.2 in fullframe), I heard the 80mm f/2.8 is smaller and sharper.
But in the end, image quality is incredible. Makes me wonder what 6x9 would look like, that's twice the space.
That is from when I was shooting the bridge
Now I'm kinda considering what to do. I love shooting analog because of the way the images turn out (so I consider a Leica M, Voigtländer Bessa or Rolleicord), on the other hand it's a pain in the ass to get stuff developed and scanned (I have the choice between cheap & slow [2 weeks, 8 €] or fast & expensive [1 day, 18 €], scans are only 1.5 Megapixel at both). Unfortunately it's hard to get that look from digital. Analog b&w has my heart.