The beauty of multichannel SACD comes through on a recording that was set up to capture a great sounding space as it really sounds using a 5-channel Decca Tree, a soundfield mic, or even a double M-S system (such as the Josephson or setting up a coincident Blumlien-Omni group through a multichannel matrix.
This recording is simply astounding:
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This too:
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The soloist is focused in the center, you have the orchestra perfectly balanced across the front field and behind you hear the space of the hall and swell of the low frequencies.
Other great SACDs include old 3-channel RCA and Mercury recordings from the 50s and 60s which are reproduced in their original 3-mic/3-channel layout and reissues of 70s quadriphonic recordings in 4-channel.
There are currently over 4400 SACDs in print - twice as many as a year ago. This format is not going away any more than LP is. It's just largely a classical format. Only about 8% of the releases are pop/rock.
SACD is a killer format. Just don't buy stupid SACD releases.