...and what's very annoying in 400h when you accelerate fast-the engine is not as loud...
Really? That's annoying because the engine was too quiet? Boy, you can be easily annoyed :-). But I have driven the RX350 before I bought the RX400h, and I thought the 350 was a lot slower in acceleration when entering freeway. Plus, I thought the 350 was less spacious than the 400h (but maybe it's just my imagination since they are almost identical).
I have not driven the GX yet, but I think it should be even more comfy and stable since it's a larger vehicle. I just hate the MPG on the GX.
I bought my RX400H in 2007 new, I'm loving it.
Acceleration , MPG are great. The only problem is the wind noise on high way , I had to remove the roof rack because my smart dealer could't find out that problem. I'm a happy man now :P