It took me a while to finally get this one (first time I received the regular CD that I already had, I'm still amazed by the fact that people are unable to distinguish both formats...), but I've been playing the SACD version for some days and I gave it a 8.
At first I was afraid that the rear speakers were only receiving a duplicate from the front speakers, but in fact not. The way the percussive elements are spread around is very subtle and it gives you the impression that you're with the band around a camp fire. Very cool.
The acoustic guitars are quite lound in the rears and it envelops you totally. The choirs are powerful too.
I looked closely at the booklet which is strictly no different than the CD's one, so I'm still wondering who did the 5.1 mix ? Is it Bottrill, like the stereo mix ?
I'm a big, big fan of Bottrill and if I'm not mistaken, this would look like his first 5.1 mix...