Very smooth car and very comfortable! The only thing that is not electric is the Steering. The trottle is electric and the brakes are also. The suspension is all hyrdolic, so no springs. Its a really nice car but VERY heavy. I would like to see what the SL500 feels like power wise. Its supposed to be putting out 400hp. Too much money though, the SL400 is 85K and the SL500 will go for 105K......heartstopping