I have a Kenwood setup at the moment, they do a freeview unit for it but to be honest I have no more room left behind the stereo and from what I hear the signal pickup's not the best. I barely have any time to put DVDs on or play films off of my iPhone let alone watch telly. I've got a video system to hook it up to yet.
Plus if you get caught with it playing whilst driving you'll get arseraped in every single way.
Dem b**ches will definately suck on your man sausage if you can watch Top Gear or QI in your car at any time. Fact.