Not a good experience! Got a flat due to a screw on my front right tire (20") - ironically near the supercharger at the factory. Since I was able to fill up air and the tire wasn't losing pressure fast (about 3-5 psi in about 12 hours) I took it to Wheelworks for repair. There was no sidewall damage but apparently all of the 20" Model X tires are not repairable even if there is no sidewall damage. Apparently there is an acoustic pad inside the tire and if you get a nail on your tire this pad gets damaged or not possible to repair because of the acoustic pad. To add insult to the injury of having to replace the tire for a simple nail, these tires aren't available freely and the spare tire program that is available on S is not available on X, I had to tow the car to the service center and pay $ 550 for a new tire. The fun of being an early adopter!