My first experience with carbon is not too swift. The Trek 1500 came with a Bontrager carbon seat post. I picked up my bike at 9pm at the LBS fresh from getting a new chain and tune up. I go to raise the seat post and the clamp took four full turns to loosen enough to move it. There was a 4 inch crack down the back of that post. But I guess I could be opening a can of carbon worms if we get into the goods and bad's of carbon v.s. metal seat posts...