I have this X5 with Sport Package as a compromise between owning a fast sedan and owning a practical family car. I save on insurance in MA by not having two cars. I have not been disappointed. It will go well over 120 mph when I want and it tows the boat to the cottage a couple times a summer too.
Acceleration and handling. For an SUV this almost handles like a sedan. Nice interior. Great head and leg room, I am tall, and it has memory steering column, so it is easy to switch back and forth between my wife and me.
Steering with the 4.4i is a bit heavy and isolated feeling from the road. 3.0i feels better, but I wanted the big engine. The X5 could use more cargo space.