Uh, the only CD's that I have played on both redbook and SACD stereo, are Diana Krall and Norah Jones. I didn't AB them, I played them one after the other. I thought the SACD sounded better. I must admit though, I understand your memory erases almost immediately. Plus, I probably was psychologically inclined to go with the SACD Stereo version even if it didn't sound better because I wanted the technology to be succesful, and I also probably wanted to justify my purchase. On the other hand, I did the same with Michael Jackson's Thriller and without a doubt the redbook version did sound better than the SACD version. I was EXTREMELY dissapointed. So I think that justifies me to say my ears are very discerning. So maybe 2 channel SACD DOES sound better than redbook!