I changed the tires to a Bridgestone with a 45 ration rather than a 40 -- with huge improvement in ride and noise. But the build quality isn't there - and rattles are getting bad at 30K miles. Now have learned that rear shocks/struts need replacement. I am very, very angry. Finally, the navigation system Toyota makes is simply no good - maps OK, but the lady inside has no sense of direction. I'm very surprised and disappointed at the reliability factor.
By all means get rid of Yokohama tires and redesign the navigation system. And get the build quality solid.