I've never encountered a failure with my Hasselblad CFV 50c or 907x 50c system that wasn't due to user error. The 45p lens did give me an error once, but I quickly realized it was my mistake—I hadn't secured the lens properly to the camera while rushing in bad weather.
As for the negative comments about the V system, I can only share my experience: I've shot with the V system for 40 years of commercial and personal work without a single spacing error from any of my film magazines, whether they were 120, 220, or 70mm backs. For 15 of those years, I shot special events, weddings, and portraits on location in Atlanta—some of the toughest conditions for setup and breakdowns on gear. The only recurring issue I faced was with the flash stems on some of the "C" lenses, which required occasional repairs. Still, I can't complain—this system built my career.
Recently, I ran 120 films through an A24 magazine for an
article, and while it produced expected odd spacing, it did not produce any focus issues, and the entire 12 frames are usable. I also once had a Bronica that I took in trade and enjoyed using for a weekend, but I knew it wouldn't have held up to the demands of the commercial work I was doing back then. Similarly, I tried an RB67 that I took in barter that ended up needing repairs for a mirror jam; after it was fixed, I gifted it to an assistant.
At the end of the day, it's different strokes for different folks. But one thing holds true: if you buy used gear without knowing its service history, it doesn't matter who made it—you're bound to encounter a surprise or two. Here's hoping they're the good kind.