I'm running the A1 with FW2.0.
I never have skipping on store bought disc or clean netflix rentals. However, I got a few of the HD Sopranos discs that were scratched all to hell. Sure enough, each disc skipped several times, including locking up the player. The spots were all repeatable.
I don't really blame the A1 all that much. I'm sure drives will improve over time. The severity of the disc damage makes me more angry at disc carelessness than it does at the Toshiba.