Hmmm, I had pretty much given up on PLIIx music- as I really didn't like the way it seemed to collapse the soundstage down into the center channel speaker. I was, in general, a lot happier with the DTS Music mode. But, I figured it was just me ;-). Are you guys telling me that the upgrade makes a significant improvment in this regard? If so, my motivation to get it installed just took a big jump.