For what it's worth, I used to have an RM-9. I had a few problems with the biasing circuit components (esp. pots) and Roger assisted me in fixing them myself, talking me through the procedures, giving upgrade advice, and explaining everything (and I do mean everything!) to me in the friendliest manner. I know that, like all-too-many brilliant designers in this field, he can be eccentric, arrogant, and close-minded. But in my experience he was always polite and extremely helpful and forthcoming.
By the way, for me, at any rate, it was seldom a problem getting 'hold of him by phone. I do believe it helps if you appear to understand something about the subject and have a little experience.
Lastly, the sound of the RM-9 left little to complain about. The only reason I got rid of it was a need to use class A ss amps on my Shahinians.