The advantage of the optical connection is that you don't get electrical noise through the cable. I have a Toshiba DVD and have compared the outputs, the coax gives you much better sound. The transport though is not very good whwn compared to a good CD transport. I compared it to a Theta Jade, CAL, and Spectral. Raanking them 0-10 measuring how accurately they were able to reproduce high frequency sine waves from a test disk:
Spectral 10
Theta 8.5
CAL 7
DVD COAX 5
DVD TOS 3
Spectral 10
Theta 8.5
CAL 7
DVD COAX 5
DVD TOS 3