Thank you to those who have left comments to my observation re harsh suspension. Although only a small sample, it would seem to indicate that there is an issue here. I will be discussing the matter again with the dealership which supplied the car new. I am particularly sensitive to this issue as, before deciding to buy the car, I specified that I was looking for something with a smoother ride than that of my Mercedes and tried several demo versions of the IS300h and did not feel that the suspension was harsh, with the exception of the Sport model. In this case the dealership mentioned that the Sport did indeed have a firmer ride set up. It occurs to me that perhaps the weight of the batteries requires a a slightly firmer ride set up than that of a conventional model. In the absence of an explanation, I am at a loss to understand why Lexus would choose to equip what is, in all other aspects, an excellent model with such harsh suspension.