Wonderful car overall. I had owned an Acura RL and BMW 5 series prior to purchasing the Hybrid GS450 only about 4 weeks ago. Downsides are small trunk space and less than predicted fuel economy (so far, only one tank and I got 22 MPG...the vehicle rating claims are 24-28 MPG). I find the car to be a great combination of comfort and performance.
Appearance of car, interior gadgets/features, amazing acceleration/power.
Trunk size, rear seat width could be 3- 4 inches more, fuel economy seems to be missing the predicted mark.