Frankly, some of these MoFi and AF stereo-only SACD's don't sound so great. They are encumbered by old mixes and old tapes. I have one SACD with so much noise and crap in the background, that a low-res iTunes download is the more listenable alternative. For my preferences, the biggest advantage of the 5.1 MC releases is that they go back to the original multi-channel tapes and create a product that is much cleaner sounding with more depth, ambience, detail, etc. A number of AF quad reissues, although old originals, also seem to exhibit many of the advantages of a late 5.1 mix. If they could make every stereo SACD reissue sound like Alan Parsons Eye In The Sky, I'd be very happy faking stereo into surround sound with PLIIx or L7. But they can't. And when we do get a modern 2-channel remix it is packaged with a 5.1 remix anyway. So labels, please keep feeding us the Quads and the unreleased 5.1's stuck in the vaults.