Actually I'm impressed at how good the M22's are compared to the M80's. Seriously. The M80's have more presence in the room, and are more faithful at reproducing that 'whole orchestra spread out in front of you' feeling. They have better bass response, obviously, but everything else about them is just like a bigger, meaner M22.
I love the M80's, they're not going back, but these showcase just how damn fine the M22's really are. There's nothing wrong with M22's at all, and I will continue to use mine as rear surrounds as I do a lot of surround SACD listening.
I can say one thing for sure: dedicated amplification rocks. I have a pretty decent receiver. Not the worst, certainly not the best - but a solid receiver. There is most definitely a difference in powering even the m22's with the dedicated amp vs. the receiver. I don't think I will ever go back to a non-dedicated amplifier system.
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>>So much more presence than the M22's.>>
Lets be nice now... 
