I see most of these postings were done in 2006 and there were a few that predicted the death or demise of SACD. Well it's 2013 and the format is still hanging on, thankfully as I took the plunge and decided to go the SADC route as I can't live with the downsides of vinyl right now.
When I compare (I admit this is possibly an unfair, maybe even invalid comparison, though it is interesting to do) SACD and an MP3 rip of the CD track (on an album, Super Bass 2, that has the same mastering for SACD and RedBook), I agree with the above quote. Despite the fact it's quite a subtle difference, it definitely adds enough value for me personally that I'm planning to get more SACDs for my collection in the future.
Cheers for the interesting discussion from 2006/07