Hi there, I have proudly owned a GS450h since July 2006, it is a fantastic car, had only two problems, one with the wheels all were replaced under warranty due to poor chrome finish and the other is/was noisy on restart if only run for under a minute from cold in the morning, various attempts by Lexus to cure problem but still not 100%. I use either straight from garage or leave running for approx 2-3 mins, this seems to resolve the problem.
terryh