My Model S spent the bulk of its life in the Pacific Northwest, where we put on over 230,000 miles. It now has just shy of 260,000 mi. I've never had a single problem with the air suspension, although Tesla did proactively replace the pump on their dime, during a service visit when I was having them replace the rear hubs along with all the rotors and brake materials, just a couple years ago. Well out of warranty. Apparently it was supposed to have been done some time ago. So, my single data point says that there are not much in the way of problems with the air suspension system.