I have not heard the RC10, but a friend of mine just picked up a C-200 system w/Onkyo Rx. I can honestly say that I did not particularly like them for music, although they did sound good on movies and games (and he's ecstatic with the upgrade from crappy HTiB). They seemed kind of harsh and lacked any 'fullness' (I played a bit of Feist for vocals and Vivaldi for music). Mind you it wasn't really set up well (awkward placement as it was a new system in a new house with boxes and furniture everywhere) but that should mainly affect imaging (which was unsurprisingly non-existent) and the like.
My M3s in a 2.0 setup, on the other hand, do sound very good with music, including classical (listening to Holst now). The M80s are better, but I'm not gonna be giving up my M3s any time soon.
All my speakers are FO and I have noticed maybe two blemishes that may or may not have come from the factory, and I really had to search hard.
