I can't comment on the RB 880 but I did have the (?)RB 991 which was a great sounding amp. Since that, I've gone from tubes to battery powered amps and now have a Burson integrated which, now that I think of it, sounds very similar, in some ways, to the sound of the Rotel RB 991: big, upfront, alive, never shrill, even handed, deep and tuneful. The Burson has the edge on detail, ambience, tone and separation, enough to justify my having it. But on it's own merits, I miss that Rotel amp.