Well, after testing the hell out of the unit, I haven't experienced freezes or lock-ups as other people seem to have suffer. But I noticed that some games, trailers and movies played through the optical (i.e. coming from the PS3) were not giving me any sound output. So what did I do?
Removed the optical from the PS3.
Configured the PS3 to output the sound through HDMI to the TV.
Connected the Optical Out from the TV to the Panny unit.
Worked like a charm and it still sounds great.
Just watched Shoot Em Up on Blu-Ray yesterday.
Will post a review this week or over the weekend probably (alongside 30 Days of Night review! ;-)).