I have just picked up a new iPad and with it a Snugg case and a Snugg headrest mount
Very impressed so far although I've only tried it once today. The Snugg stitching and colour even matches the seats! - not seen them in the cold light of day just yet though.
The other thing I like is that it's a case within a case and it's very easy to put the headrest on the seat back (velcro strap) and easy to take the iPad (still in its Snugg case) in and out of the headrest mount - so no messing around with switching cases
The new retina display on the latest gen iPads is awesome. Was using a Samsung Galaxy Tab recently and there is such a huge improvement - no contest
Word of warning that you need a 10W USB car charger, lesser USB car chargers will not charge the iPad. No chance of BMW USB having enough power either I'm afraid. This one definitely works with 4th gen iPads:
PowerGen Power-U Dual USB 2A 10W (fast) Heavy Duty Ouput Car Charger
Have taken some pics but they're all in the dark quickies on the iPhone so not great