You DO know you can go into the player config/setup menu and change the audio sync don't you?
What you are actually seeing/hearing is not the result of your DVD player but you TV. Almost all HD TV's have sync problems because the video data is a lot more complicated and takes a moment to actually calculate/display correctly. This is why the higher quality DVD players have an audio sync/delay function, so that it "delays" the audio so that your TV has time to decode the picture.
I don't know if the others in the above got bad units or something, but the DVI video out from the Oppo is THE best out there. Benchmark after benchmark confirms this. It has the most accurate output with some of the fastest response times. The only other DVD players out there that have almost as good a video out are the Denon DVD-5910 ($3500) and Denon DVD-3910 ($1500). I personally have the DVD-3910 and an Oppo. The only reason I have the 3910 is for the audio output. If I didn't have $12k in speakers/subs/amps, I wouldn't have bothered with the 3910. I will admit the the "tray" is pretty darn flimsy on the Oppo, but at least I know that just about every cent of that Oppo is in the electronics where it is needed the most and it shows. The picture from the Oppo is clearly as good or better then the $1500 DVD-3910.... Its audio out is fine for most people (even more so if you are using your TV for your speakers...).