I've had a music reference RM-10 mk 1 for many years and absolutely love it. I'm currently using it in my second system but, in the past, tried it in the main system in place of my joule electra rites of passage to see how it would sound. I liked it so much I kept it in place for many months before reinserting the rites.
I'm running a matched quad of sovteks in it.
Mine is super stable and quiet. It has a magical addictive quality to it. I believe the reasons there are so few for sale is there aren't very many of them, and everyone who has one simply doesn't want to let it go.
I'll be interested in hearing your impressions dhcod.