I have a Klein Quantum II road bike which may be the stiffest, most uncomfortable ride in existence. After a lot of research, I finally got a U.S.E. seat post. But after using it for a couple of seasons, I honestly don't think the thing provides much suspension. Add to that the fact that it's as heavy as a boat anchor, has the world's worst seat clamp and costs a lot, and it's pretty obvious I wouldn't recommend it.