It had "0" (zero) hours on it when I set it up. I was actually the first to unbox it. The first hour or two I was a little skeptical but kept an open mind. I still have a ways to go for break in. I am only at around 150 hours or so right now. I know that I should not make such proclamations, but this is unreal. I know it will only get better and was thoroughly warned to wait until passing final judgement until 600-700 hours. Even if the Ref 10 gets no better, I'll still be happy. Knowing it WILL get better makes me ecstatic. Even fresh out of the box, it blew away my previous Ref 6. I don't want to disparage the Ref 6 because in the right system, I think it can be great. It was just not "my" taste. The Ref 10 doesn't even sound like it's from the same company.
Yes, the ARC/D'Ag combo is unreal. I can not believe how the stars aligned, clouds opened, and allowed me to acquire these amazing pieces. I still can not believe what I am hearing and this is "only" with my Revel Studio2. The Studio2 just don't get the respect that they deserve. The JBLs should be hooked up next week. That will be fun for sure.