I am a Lexus person and have an LS 430 which I think is the best vehicle I have ever owned. I have been disappointed with the RX400h. The fuel economy is below expectations at 19-20 in normal driving which is mostly in town and 22-23 on a trip. I have asked the dealership about this and they mostly just shrug their shoulders. It seems to me the gas engine cuts in at too low a speed. The front seat is too small for me at 6'2" both in seat size and headroom. Have had battery problems. Battery is too small. Also, it seems that the dealership is still not up to speed on the hybrid model. They keep telling me to call Lexus directly. Disappointing.
Acceleration is fantastic. Love the power rear door. Rears seats are easy to lower and raise.
Improve fuel economy. Navigation system is too complicated and both touchscreen bluetooth phone and nav system are pretty much disabled when vehicle is moving although you can call from your cell phone which is still connected to the car system. Need to offer keyless entry as an option