@Icorem : I compared it with the X600.5 amps. For me, it was quite revealing. Many amps gives large bandwidth, dynamics, wideness and depth, but the MC-811 add magic! The sound is so natural that it's hard to describe. If you like the naturalness of the MC-601, the MC-811 is a "reference" in that regard!
I need to capture all the emotion of a good recording and with my MC system, i get that and even more...EVIDENCE!
I love Pass labs as well but the MC-811 is something rare...really.