I have installed the unit. I take back what I said about the manual being better quality than that of the AVC 9000 - it sux!!! What I should have said is that it is printed on better quality paper.
For anyone else that has trouble pairing their phone, I found out by trial and error that despite the manual saying enter the code 1234, it's actually 0000. Also, it took me a while to figure out that the baud rate of the supplied GPS antenna is 9600bps (the unit came with it set to 4800).
Anyway, despite the general shittyness of the manual, installation was a breeze. There was no need to connect the accessory or illumination wires, it gets it all from the can-bus. Turning the headlights on dims the display, which I was a bit worried might not be the case. The illumination of the buttons is a bit brighter than most of the illumination in the car. I can live with it for now. I haven't tested whether connecting the illumination wire to a voltage somewhere between 0 & 12 volts will adjust the brightness of illumination accordingly - or whether it is simply illumination off or on. I'll save that one for later.
Once you have the dash apart it's simply a matter of unplugging the old unit & plugging in the new. I happened to have a couple of smb cables lying around at work, so was able to bodge up my own "fakra y-adapter" cable for the antenna(s). It turns out that a fakra connector is just a normal smb connector with a fancy coloured plastic shell around it (which you can do without). I didn't try it with just one antenna to see how it performed, but with my current setup AM & FM present no problems at all.
I forgot to bring my ipod, dvd, mp3 cds etc. to work (where I am now) so haven't tested any of that side of things. So far just the radio, Bluetooth pairing, and GPS.
The radio is fine - no probs there, and yes the unit works absolutely fine with the amp under the passengers seat.
Bluetooth pairing works well too, once you enter the correct code (0000). I'm yet to test the call quality (which might not be that flash, since it has a built-in microphone) but I am pleased to report that the phone button on the steering wheel can be used to answer an incoming call! Also, if you have a A2DP phone it will stream music you have stored on it. This works fine (sound quality wise) but you have to know what's on your phone because the head unit doesn't show the folders/song titles on the screen (at least I haven't figured out how yet, if it can). The phonebook thing needs work. It's extremely slow to scroll through your list of names/numbers and doesn't seem to put them in any kind of useful order. Maybe my phone has something to do with it? - a Nokia 6100.
The GPS seems to work fine with antenna mounted just above the head unit under the centre air vent. (I know Tim, you said to mount it on the dash - I have left plenty of slack in the cable to easily remount it if necessary). It locked up to 8 satellites straight away with booming signal strength, will have to see how it goes. The supplied GPS SD card is a bit naff. Despite being in English, some settings are still in Chinese. It also seems to revert back to yards instead of metres, every time the unit is turned off. I think I'll be updating my SD card to something more appropriate tomorrow.
I haven't bothered trying the TV tuner out - I'm really not interested in it, and the kit doesn't come with a TV aerial.
A couple of other things, you can't turn the radio on without the keys in the ignition like you can on the RCD500, and the maximum SD card size that it will read is 2GB (in case you were thinking of putting all your music on one of those).
I will post my thoughts on the mp3 / dvd / ipod / upgraded GPS software side of things once I've had a chance to play with them over the weekend, and I'll take some screenshots too...