If you are just wanting to see how it looks in an x, there are several threads here about it. I was able to get a brand new one for $400 direct from pioneer. It was a special work promotion this month. I am assuming they are clearing inventory for the new models to launch.
I am going to run the Ipod, Bluetooth, Reverse camera, and tv tuner off the the unit. You can get an adapter for steering wheel controls for the head unit as well. IT seems all the reviews are pretty positive except for the lack of HD based navigation. You do have to leave the nav dvd in the drive when you are plotting a course or making changes, after that you can remove it and watch a movie while the map is saved in the system. I want to install a tv tuner but am having some trouble finding one at a good cost that will interface with the unit. It looks like I am going to have to get a generic one with RCA input.
Overall the unit seems pretty strong for more than casual users. It can be customized pretty easy with wallpapers and colors. The best place to do research when you buy one is at
avic411.com . Ill post some pics of my complete install when I get all the parts in.
Here is a thread with pictures of an installed d3