I've had these wheels for about a year now and couldn't be happier with them. I think they look absolutely amazing and I also strongly believe that 20" are the PERFECT size for the Model S. 21"s compromise the comfort too much imo, and base rims are just way too small and boring. My tires are also quite a bit wider in case you're curious. I have 265s in the rear and 235s in the front. They make the handling of this car also quite a bit better with sticky Continental Contact Sports.
Anyways, just wanted to share this pic I took today. I thought it came out great