[bichoo]

Coming from a smaller X3, IAS made the X5 feel so much smaller in tight spaces. To me, its a must have feature for a vehicle of this size. At higher speeds on tigt turns, the vehicle does seem to be "more on rails" as the rear wheels turn in the same direction as the front as you don't feel the rear is slipping out.
And yes, i have seen the real wheels move when parked and the steering is turned.