Yes, I too find this engine to be the most unrefined of any car that I owned in decades. I also get high wind noise at speeds above 50. Lexus, as typical, says that nothing can be done ("unable to diagnose wind noise problem"; engine has mechanical timing belt...it is noisy" In other words, live with it. The navi system does not allow the passenger to program new information while the car is moving; Lexus says that this is for safety reasons. Safety, in this regard, is not the responsibility of Lexus; it is the operator. The Lexus is my wife's car and she likes it. I have a 99 Acura TL with 100,000 miles that runs far more smoothly that does the Lexus. Lexus is just relying on their reputation but that will disappear if they fail to make changes. Look what happened to Mercedes when they had, and still have, huge quality and reliability problems.