Here is my general reaction to these comparisons.

In a piece like the RR2150, what I would be looking for is primarily "doesn't do anything annoying". Given the reviews it looks like it does some things pretty darn well, but the review that caused me to place my order was Mikey Fremer's putting it into a no-holds-barred system. The fact that he played music through it for at least two days from a very very good source through very revealing speakers spoke volumes for me. It didn't do anything that made him yank it out of the system. That to me in a $600 receiver is very good because at this price point there are compromises made all over the place in the design and build.

Just my $0.02....Roger