to be precise I am an owner of an M92S..
I just disassembled it
and noticed some differences with the M92 pictures ..
it is not present the wacom board and this is obvious..
THE RAM chip is different, and maybe even the cpu code (have to verify better)
and on the e-ink screen is written 1.11 instead of 1.33 ..
this make me think that M92S has not a real pearl screen ..
infact to be honest the gray level of the screen is very similar for me to the irex dr800 one.. and for sure it is not as white as the sony readers you can find in the stores for example.
I have to take some pictures ..