Run flat tires are an interesting concept, however, no spare tire comes with the vehicle. Run flat tires have to be replaced after driving no farther than 100 miles. My dealer has no run flat tire in stock. If you're somewhere more than 100 miles from a dealer,or it's a Sunday, or, as in my case, the dealer does not have a replacement...guess what. Decided to order the non-full sized spare tire (the only one that will fit in the supplied empty tire well). Dealer price for the temporary spare is $331.00! Lexus Customer Service was a further source of aggrevation...they suggested that "a spare tire kit was available." Thanks Lexus, for incredibly un-Lexus like foresight!
Levin sound system and XM.... great! Nav system very well designed, but a little busy.
Ditch the run flat tires... or, at least, supply a spare tire as a standard feature.