When it comes to handlebars, most would agree that carbon bars absorb more shock than alumimum. That shock is absorbed from bearing weight over a horizontal run of about 10 inches of bar between the stem and one's hand. That being said, does a carbon seat post have better dampening properties than an aluminum post? My initial thoughts are that since the load is vertical on the tube, the material will have less effect since it should be more rigid on this axis. Has anyone ridden the same bike/seat combo with both types of posts?