Just listen to a MP-40, 50 or 60 (all models share the same analog output stages and most stuff that affects SQ) in stereo or surround, even before running RP. The main difference I heard when moving from my "top of the line" Onkyo processor was the improved dynamics and the almost scary transient response! Night and day. And suddenly proper "imaging" of stereo sources. If I did not already have the MP-50 I personally would have saved up and bought the MP-60 as it is the most future proof and has all the options including digital outputs.