I traded my Mercedes GL450 because we wanted something slightly smaller, but not give up the utility, and luxury-comfort. The X5 hits that mark perfectly. It has sporty handling but is still luxurious and quiet. Gets 20 MPG which is great in my book. I'm 6'4" and 300 lbs and am super comfortable in it, and... my kids have room in the second seats!
Nav, and sporty handling. Overall Luxo- feel to the interior.
Interior design. Move door unlock button from the center dash to the door. Tailgate lift can be hit accidentally, (Bad if you are in your garage). Put paddle shifters on a sporty vehicle!