Though I've been reading this board for weeks this is my first post. I thought it was an appropriate place to start since I installed a Mark II in my 2001 Denali as an auxilliary player (in place of the in-dash cd changer). It looks perfect in this place and the actual installation is not that hard. The most diificult challanges were:
1. Had to cut the front of the mounting cage so it would fit behind the Denalis faceplate.
2. Filed the faceplate cd changer opening so the empeg unit would slide thru it and then into the mounting cage.
3. Purchased an adaptor from peripheral performance that allows control of a kenwood changer (mounted under the rear seat) which has RCA inputs for an additional player.

The unit works flawlessly and looks like it came in that spot. The only thing is that my remote door locks do not work well with the unit I (so I reduced the turn off to 5 sec. as suggested in a previous post). If you need anything else let me know.

Good luck!

PS THe Denali is awesome and would highly recommend it!