I had a chance to sit inside a Model X in the 7-seat configuration, and here are my seat-of-the-pants impressions: Front row: Driver's and front passenger seats felt great. When is Model S getting these type of seats? Overhead windshield has interesting cockpit effect. 2nd row: Again, seats definitely felt better than Model S, although the middle seat head room was not good. I'd get the 6-seat setup. Yay for cupholders, but where are the door and seatback pockets for stuff like books and iPads? 3rd row: I felt trapped. The 2nd Row does have the convenient motorized front/back movement to allow ingress and egress, but it is a bit slow. Again, I'd get the 6-seat setup. With the center aisle, the 3rd row might be tolerable as it allows for people to move in/out more easily, and also gives more leg room. If $ were no object, I would take the Model X 6-seater over the Model S. That's pretty much it. I've driven the Model S P90D and I know the Model X drives similarly (just a bit taller in visibility for driver), so I felt no need to take a test drive.