What nonsense! These are some of the best items around in their class. Moreover, SACD sounds great in stereo as well as surround - it's simply silly and illogical to state that the encoding method is better experienced with more than one channel as a function of its design. It's either good, or it's not.
I have the PM-10 and it's not going anywhere (I come from a background of high end triodes and tube amps). Will be getting the SA-10 shortly too, as it's vastly superior to much out there - including the Sony XA5400ES.