Janek,
do you think that if you put to your car petrol which is wrong and your car fails to work or even your engine is broken, the producer of car is liable? (Because his car does not work on wrong petrol and he did not warn you that not all petrols you buy at petrol station allows your car to run...).
Of course the owner of petrol station is liable not the producer of the car.
Applicated to our case. The maker of given pdf is most probably "responsible" for producing pdf that is not correct pdf and because of it disables it being read on certain devices - e.g. Onyx M92 and maybe others...
OK. Back to earth. 
What is the point of the bizarre pdf story? As a user I have two options:
1) Do not buy a reader or return it to the producer under warranty (let us expect producer will accept it as warranty case, even thought, to my opinion, it is not)
2) Do not read bizarre pdfs, which are a little fraction of all pdfs and/or somehow "fix" bizarre pdfs, so that they are readable.
What do you recomend to those who decide for 1)? Which 10" e-reader would you recomend for reading such files and scribbling and annotating?
I know none, but maybe some exist.