We had a variety of discussions on this topic. I for one feel a difference on one. Others say they don't. It appears to be up to the individual what their perception is. That is all I want under me. I guess a good way to look at it is some folks ride aluminum bikes and wonder what all the fuss is about a buzzy or rougher ride and others can hardly take aluminum at all. It is very individual. My experience is based on riding the same bike with and without a carbon post. However my butt is sensitive enough to know when my rear bearing have become loose. Weight really shouldn't be the reason for the choice. The super light weight ones would have to be replaced to often for me.