I have been floored by the sound quality of SACDs before, but not in awhile like the way I was by the Alice in Chains Greatest Hits SACD. It is simply outstanding sonically. I also own the CD and put both discs in a Sony SCD-C555ES changer and listened to both extensively (stereo track only on the SACD). To say there is no comparison is an understatement. One of my favorite Alice in Chains songs is "No Excuses", and I can't get over how good this song sounds on the SACD. There is so much more air and depth around the instruments on the SACD it isn't even funny. The CD is practically useless to me now, except I will use it in the car. It's SACDs like this one that make me want to go out and buy every one I can find. Truly amazing. I'll try to listen to the multi-channel SACD track tomorrow night. That should be interesting.