Have had my GS 300 AWD for a month now, and its simply the best I have ever owned. Ride is smooth, interior is "out of this world", and the acceleration and handling make it a ride to look forward to. Getting good gas mileage (24-25 mpg) and the car gets nothing but compliments. Other than the trunk being a little small, this is one wonderful automobile. Tested many the others (Acura TL & RL, Infiniti G & M, Avalon) before buying, but the Lexus is the "class of the class."
Beyond solid feel and the wonderfully smooth acceleration and ride. Best interior of any car I have seen. Keyless feature is fun, and makes you wonder why you ever had keys. Standard stereo system is very nice.