I know this may not be of much help but years ago I used Bronica S2' s exclusively in a professional studio. We had several because they had Nikkor lenses and were cheaper than Hasselblads but they were always breaking down. I couldn't remember a time when at least one of them wasn't at the repair shop due to mostly transport problems or jamming. After a year or so of dealing with the S2's, we went to Mamiya TLR's (less problems) and then Hasselblad.