overall i think that the asus is better as the plextor
only negative about the asus is that its slow at reconize any media you insert, and you need to have some patience when you pressed the eject button.
but asus reads regular bit paterns much much better as the plextor. (my asus did 28sec over 11000 bad sectors, my plextor did the same 11000 bad sectors in 6.10 minutes!!!)
and when i use the plextor for a DPM read i never got a nice line, the spikes where always all over the place. and the image regularly didnt work.
my asus produces nice lines when DPM reading every time, and none of the images i made with the asus failed to work.
as you can read i had both drives, and i favour the asus big time above plextor.