Thanks Chris, very much appreciated.
So far so good. The screen is ok, touch and drag is very responsive. Loads of outputs (and inputs) on the rear.
Downsides are it appears a little sluggish loading track information for the iPod. It changes track quickly but takes 5+ seconds to read the titles, info and artwork.
It has USB, but you have to choose between iPod and USB when installing it - you might be able to rig something up but you generally have one or the other.
LinkSearch is neat if you are using an iPod. You can search for all music from the currently playing artist - or find related tracks. Very neat.
DVD and video I havent really had a chance to experiment with yet.
Setting custom backgrounds is a fiddle. You have to create the image, distort it, and then view it as a slideshow and "capture" the image to the HU and then you can set it as your background.
I havent really had a good play with it yet, but I'll keep you posted.