Hmmm, a bit testy today Jim?
C'mon - you know I love stereo as much as the next guy. My point is not "mono is best" ... but rather: Sometimes, stereo doesn't MATTER.
I repeat - the problem with a stereo sample that sounds bad in mono is the sample, itself, not the system, so don't fault the PAS for lousy Yamaha samples.
Stereo effects have been a large part of the "sizzle" in sounds since the very "average" M1 of old.

All I'm sayin' is ...... for the road warrier who sets up and tears down more than he plays ..... the PAS has been a GOD send. Everything we do involves compromise. This is one area where the mono aspect is minscule compared to the studio quality, even sound that fills the room.

My advise to you all is to stop reading about this system, and PLAY one. On YOUR gear. Tweak it, experiment with it, and make your mind up. For me, the choice was easy. The improvement I get in sound with the Bose has been far greater than the loss I get from a mono sound. It's such a small deal really ...... the rest of the package has so many advantages - I could never go backwards. Remember, I also have a second tower for those times when stereo can be effective. I want it all, and I have no desire to entertain the priesthood.