I have owned the 400h and now own the 450h and I find that both of the vehicles had and have a stiff ride. The 400h is a much faster vehicle and quieter with less engine noise. The 450h give a bit better mpg. The eco system on the 450h is a joke and should not be used as it decreased the mpg. Try to get the front wheel drive and not the all wheel drive as the tire wear is excessive in the all wheel drive.