I just got the new Pioneer flip screen system installed in my truck 2 days ago and all I can say is DAMN I love this thing.
The picture quality is outstanding and it is touch screen as well which I have always wanted. I put Underworld in there to test out the DVD functions and the movie looks very good, much better than I expected it to be.
You can control amplifier settings from the unit rather than go to the back of the truck to adjust things. Did I mention I love the fact that it is touch screen?
The navigation is built into the head unit so there isn't a seperate piece of equipment that needs to be purchased to go with it. You can do split screen with the radio and Navi which is how I keep it right now. The unit supports voice recognition so you can keep your hands on the wheel and control things.
What really adds to the value of this unit for me at least is the fact that you can monitor vehicle properties through the unit. Angular velocity, side slope degree, voltage, lateral g-force, forward and backward g-force and a compass. Very handy to have up on the screen while offroading. I'm in the process of hooking up an HCam to the system and should have that running by tomorrow or Tuesday.
Enough of my rambling, here are some pics. You may notice my picture taking ability has been somewhat hindered by alcohol...