I had a set in mine mate, used the mounting where the rear seat belts clip into, these made the rear seats unaccessable, because harnesses work like old seats belts where you manually adjust them to fit you, this means once they're adjusted up, the front seats wont flip or slide forward, as the harnesses are to tight, so to get into the back you had to lossen them right up, and then no one could sit in the rear apart from in the middle,even then they had to climb over the harnesses(as they would be sitting with the belt coming from between there legs, even a bit of a dirty bird up for a bit odd pain with her pleasure wouldnt like that)
and, if you got an install in your boot and you use your rear seats to stick the shopping/or whatever you've bought while you where out, some clothes for example, you cant get them on the rear seats unless you adjust the harnesses, and then while you're wearing them you cant fiddle with the radio, lean forward to see round blind junctions, go in the glove box for another cd/sunglasses, in the end this is why i took mine out
but you can get them that work like a normal seatbelt, that slide out and lock when needed to, this would let you flip or slide the seat forward, but no one in the back still
