Purchased a used 2008 Rx400h AWD a few weeks ago with about 40k miles. I had a 2003 Lexus Rx300 which was nice, but I needed an upgrade. The Rx400h is definitely an upgrade as it has many nice features. The 0-60 time of ~7 sec is very good for a v6 SUV, and the acceleration is very quick. My only complaints are the lack in seat comfort and lack of advertised gas mileage. I'm getting around 23mpg combined vs the 30 as advertised. Also the fact that the car doesn't have the new "smart key" feature as the rest of the 08 Lexus lineup has. But other than that, i am very satisfied!
Automatic rain sensing wipers, larger HD navigation screen, back-up camera, AFS turning HID headlights, power rear liftgate, Bluetooth system, voice activation, telescoping steering wheel, quick acceleration in times of need, the fact that it's silent under 20mph!
better mpg, nav being able to be used while driving, comfortable seats, better voice activation with more commands, more exterior color options (no dark blue??)