It appears reviewer MartinL is a bit confused as what SACD is . It is a means of encoding higher resolution audio on a disc .
A large number of SACD discs I have are stereo only ( Bob Dylan , The Kinks , etc ).
Just because a disc is SACD encoded , doesn't necessarily mean it is going to have a surround sound ( eg 5.1 ) mix , although some do ..
To get access to the SACD layer on a hybrid disc ( not all SACD discs are hybrids , incidentally ) , requires the use of an SACD capable player.
SACD can have mono / stereo / muti-channel mixes on a disc , or any combination thereof .
I myself much prefer playing the stereo mix only , as I find it has greater impact ( for me ) on a high resolution system ( a mix of Marantz DVD9600 player , Krell amplification and ATC speakers ).