Similar comments to DarkAdept and the fact that he seems to be in the same town as me (bought from the same Magnola store) makes me wonder if I have a multiple personality disorder These comments are my initial experience; I've not thoroughly assessed, tweaked, calibrated or figure everything out yet.
I too am replacing a 3805 which has served me very well. Main reason for upgrading: the desire to run everything through HDMI and get the on-screen graphics back as well as a general update.
Display: Pioneer 43" 1080i plasma
Cable box: Comcast Motorola DVR DCT-6412
DVD: Oppo 973
VCR: Samsung SV4000W
Digital Music: Sonos
Game: Xbox 360
The cable box, DVD and HTPC have DVI outputs. The screen has a single HDMI input. I connected everything else using the highest quality available connectivity option.
My speaker setup will ultimately be 6.1, but is currently 6.0 since the subwoofer isn't connected yet... In fact, I've been operating with just the three front channels connected since I've been doing some rewiring because I have young children and dangling wires are not a good option. Therefore, I'm going to focus on connectivity and general operation rather than sound quality at this point since I'm not in a position to comment - besides Dora the Explorer and Teletubbies sounds about the same regardless of what you do
Wiring everything up was straighforward and the HDMI connectivity has removed two wires for each source (1 vs 3 for component) so that's less volume of wiring, which is good for my confined space. My Sonos only has analogue outputs and I wanted to connect it into the CD input. Took me a while to find the CD input (had to refer to the back panel diagram in the manual) since both it and the Phono inputs are over near the speaker terminals. Some of my devices use coax digital connections for audio, others use optical (DVR and Xbox). The digital audio inputs assignable as are the component video and HDMI inputs. However, while they are labeled as Coax 1, 2, 3, they also are "pre-wired" to specific devices. In the on-screen setup, they are only referred to as Coax 1, 2, 3, so you should keep this in mind when you're cataloguing how you're connecting everything up.
Powering up takes you to the tuner and the on-screen display, which is relatively clear and colourful. DarkAdept is right in that it is essentially a prettier view of the typical menu hierarchy. It took me a little while to figure it out but it is quite straightforward.
I setup the DVD player first and that went fine. The Comcast box was next and that proved problematic owing to some digital video issues, which are still unresolved. Basically, the Denon does not seem to lock onto the Comcast's signal when cable box is connected through its DVI ouput to the Denon's HDMI input. The TV signal shows up briefly and then the display just goes black with some flickering as if the Denon is trying to figure out what the signal is. Connecting the cable box directly to the display using the same cable works fine. So right now, the cable box is connected via component since that's the only way I can get a picture. There are various options relating to the Denon's scaler and I tried playing those but nothing seems to get the Motorola box working through DVI. However, the scaler configuration (under the HDMI menu) is worthy of exploration since there seem to be some useful options here. I need to talk to Comcast to see if a new box will help. Then again I may look at an HD Tivo.
With the Motorola box hooked up through component, I notice that the colours are less saturated than before. There are colour adjustment options on the Denon, so I will need to look at those.
Other than reprogramming my Harmony remote to control everything, that's all I've had time to do so far.