Pretty sure I can find a negative review online on just about any business out there. Opinions are like a**holes, everyone has one.
Actually no. Well you might be able to find bad reviews of any business, but with respect to Rocky Mayer, the reviews appear to have a great deal of merit. The guy has had some legendary problems which have resulted in riders losing both seats and money.
The complication here is that the Mayer family tree is complicated, and one of the Mayer businesses has consistently produced good work, on time.
Coincidentally, I believe the original Russell seat was designed by Bill Mayer, before he left and set up on his own. However, that design was patented and owned by the company, so Bill's seats didn't use the same suspension system.