I burnt mine on a plextor, at 12 x (it was a test after all!) and used CDRWIN, and it plays fine. Occasionally it gets very slightly jerky, but I initially put this down to the speed that I wrote it. I will write it again tonight at 4x and post the results later.
The player has no facility to pause, or rewind or fast forward, but this is a Beta release.
I wonder if it impacts the PS2 Drive at all?