"When choosing between aluminum and carbon seatposts, our tests indicate that the carbon seatpost will offer more vibration damping on high-frequency bumpy surfaces and more flex for big bumps, while also being lighter; but they are more expensive."



Read more at From the pages of Velo: Getting the most from your post - Page 5 of 5 - VeloNews.com

that's the article I was talking about, and I should correct myself to say that VN did say they positioned the saddle in the exact same place relative to BB and bars. The amount of post extension is unspecified, however and unfortunately.