I made a big mistake when I bought this amp. Thinking (5 years ago) that I wouldn't need a Flat screen TV with HD and therefore not need HDMI inputs, I bought this amp because it had optical inputs and an 8 channel discrete input. Unfortunately Blu-ray players nor the PS3 I ended up buying later do not have 8 channel outputs. 7.1 is also not accessible from a PS3 via optical -who knew?
As a 5.1 cinema amp, this does a fine job. It comes with a microphone to set itself up. You definitely need to have a dedicated ".1" sub as the full lower frequency range does not get sent to the other 5/7 channels (as does any cinema amp these days). 5/7.0 misses a lot of the movie. It never seems anywhere near as loud as the specs claim. As there is no HDMI there is no real 7.1, the extra two channels are "matrixed" like the "x" addition in Dolby Pro-Logic 2x. Please note, it is NOT THX certified though stated above.
As a music amp, this is terrible. It sounds weak and suffers from typical Digital sound that is not continuous. I have recently disconnected my CD player form it and gone back to my traditional 2.0 stereo analogue hi-fi amp.
Most users, including myself, leave everything on "normal" and "0" (apart from its own set up). So features are quite pointless really. You do have many options DTS es, Neo 6, Dolby Digital ex, Dolby Pro-Logic 2x. It also has an ipod capability if you buy the optional Denon ipod dock.
Plastic faced, nice clear display which you can dim or switch off.
Don't buy anything without HDMI inputs/outputs. Use this only as a cinema amp with a dedicated sub, use something analogue for music.