I used one for about 6 months on an extended loan. It's a nice camera overall. The build quality is good - not in the same league as a Contax to be sure, but it's not going to fall apart either. I used it as my daily carry camera with a 50/2 collapsible Sonnar & a 50/2.8 collapsible Tessar. I prefered the Tessar usually but that was more my taste in glass than anything else. I used, at different times, a Jupiter 12, a Jupiter 3, Jupiter 9 & Jupiter 11 with it as well. All fit fine and functioned correctly. The J3, Fuji 1600 & an internal meter is a killer combination for available darkness.
I carried it with me anytime I left the house and didn't exactly pamper it even though it was a loaner but it held up to the use without problem. The owner took it on an international trip when he got it back and I didn't hear of any problems from that.
The meter was a real strength for me. I found it gave me results that I could reproduce easily and I didn't have trouble with it.
All in all, it's a modern body with several real nice features. It's not as "nice" in many ways as a Zeiss body but if you have the glass it can be a very good investment.
I was looking for one when my IIIf fell into my lap & I sold my Contax/Kiev gear to finance it instead.
Hope this helps,
William