I've used many MA957's over the years. Never had a problem. I think people just hate on them because they are mass produced and don't cost $300.
I've probably owned 5, 4 of which I bought used. The only reason I only have 2 now is because I only have 2 tanks, and sold the other regulators. All worked perfectly.
Over the years, how much do you think you've spent on probes, calibration solution, and what not. How much time invested in maintenance? Just curious.