SACD Opinions: Gimmick? Like it? Don't? Why?

I would like to hear some opinions from those who have (or have heard) an SACD cdp in a quality system. I am considering it, but in the area I live its hard to get a good demonstration of it. So before I go out of my way I'm trying to figure out if I even want to bother. I guess I'm a little skeptical.

What sets it apart from regular cd sonically, if anything?

I know it has multi-channel capabilities, but how about standard 2-channel performance? Is it even intended to be used with a 2-channel system?

Does regular cd performance suffer in any way (generally) due to the presence of sacd capabilities?

If you can't really answer the questions above in an "all else equal" sense, and rather "it depends..." then what does it depend upon?
Thanks for any opinions, Jb3