These are Rosens, which makes them higher end (you see them installed in a lot of Mercs and Italian sports cars). I'm actually taking mine in to get some fitted in a few weeks (the AV 7700 with sunvisor monitors for the front).
If you have active head restraints then these are not for you. You need the AV 7700's instead.
What sets the Rosens apart from many other models is that they color match the headrests and use the same grain of leather as that used in the vehicle.They also have multiple inputs and a built-in video gaming system. Your rear seat passengers are not confined to watching the same thing with these. One can watch a DVD while the other watches a movie on an iPod or USB stick, or plays one of the 25 built-in video games.
I looked at the cheaper systems but I wanted something that gave more functionality and allowed me to connect my iPhone (the iPhone is connected to my SlingBox at home, so this is a way to get satellite TV in the car).
All that having been said, they ARE expensive, especially when you can get a set of Pyle 7" headrest monitors for about $200.
If anyone's interested, I can post some pics when my install is done.