I have been using a Linn Unidisk SC player - which is a universal player that accepts just about any format, including all video and audio dvds. Very good multichannel handling of SACD.
While SACD as a disk based format's been called into doubt repeatedly, there are a number of SACD releases, and in audiophile circles the format's catching on. Helped specifically by some tests that have been performed by people listening to music at higher resolutions compared to lower. The most recent issue of Stereophile describes one test carried out by an engineer from Linn, who played "Unto us a child is born" from Händel's Messiah for a group of audiophiles - the selection had been manipulated. It contains four natural repeats of the chorus motif, and the engineer had spliced together a version where the first repeat was 24bit/88.1 resolution; the second was Redbook (CD); the third was 320kbps MP3; the fourth was 192kbps MP3 (the last one is still better than what most people have on their MP3 players).
No prizes for guessing which was preferred. You'll find it described at stereophile.com
The hybrid CDs with both Redbook and SACD layers are an option, but my Beogram CD 6500 doesn't much like them, locking me out of even playing the CD. Which is why I have another player that accepts the format. Linn's player is quite expensive, but since I can use it for a lot of different things it worked out. It's a cinch to connect B&O speakers to it.
The new high-definition audio formats will make it possible to play back high resolution files that are at the level of today's recording formats (24bit/32bit). These will be available on disks and as downloads - to enthusiasts. Question is whether there are enough of these around to make music producers bother - as such, it's going to be interesting to see whether Linn's downloads of high resolution files takes off. SACD will also be available as downloads, of course.