I just purchased a HD-AX1 on Friday and sold my 2910 to the salesguy. CD's do not sound as good, movie picture and sound are much better. CD's sound harder on the ears, not as delicate and warm as the 2910 can be. The 2910 is very easy to use and the HD-DVD player has issues in that area. If i pause a movie and switch to cable, the HD-DVD resets itself and goes back to the main menu. HD-DVD's take a minute to load, but CD's and Standard DVD's load almost as quick as the 2910.
In the end, are you a movie guy or a music guy? Forget that the player is an HD-DVD player, if you want better video performance in standard DVD's, the Toshiba is the call, if you are looking for better music quality, then the Denon is the call.