Test drove a Model S 90D with the bigger wheels and Michelin Sport tires. Did all the acceleration stuff which was fun, but what impressed me most was how fast I was able to enter and accelerate thru my favorite highway on ramp. The amount of grip and the planted feel of this car is simply amazing considering the weight of the car and the fact 3 of us were in it. Anyways after test drive our Product Specialist said all Model S have air suspension the "OPTION" is only to be able raise and lower it. I had misunderstood some previous posts on the forum when people were talking about not getting air suspension and the car having a more planted feel. Which would be the car would have some sort of coil/spring setup and no air bag/suspension of any sort. So which is it?