Any thoughts on Music Reference RM200

I am thinking of purchasing a Music Reference RM200. They have been out for some time and I am wondering if they have changed over the years to warrant a new purchase or look for a used amp. I would be using these on Apogee Scintillas so they better be in top operating condition. I am told that they can handle a one ohm load. Any thoughts on their sonic signature would also be appreciated. Bob