Carbon seatposts have their place in the world. I ride a Giant TCR ZERO, with a compact allu frame. This is a stiff frame, I repeat, stiff. To save money on the original purchase price of the bike, I opted for a alloy seatpost. Mistake. I rattled so much due to the unbending nature of the alloy post, I almost changed bikes. I borrowed a MDT carbon post from my LBS, and have since bought it. Why? The flex-factor so common to many carcon products counteracts the vibrations from the stiff frame, turning my bumpy ride into a smooth one. Oh yeh, I forgot, it looks bloody cool too!!!