The new Zipp Service Course SL seatpost takes everything you know and love about Zipp's seatposts and updates it for maximum performance.
I wanted a carbon seat post to match my Zipp Sprint stem, but did not want to spend a fortune. Great seat post, just enough flex to give a smooth ride but stiffer than the stock post that came with my bike.
This is a really nice post that has some nice features. I like the marking to help set up the seat angle. Great quick reference point. The one down side is the front bolt, it is so hard to get to that you almost need both hands at times to hold things till your done tightening the bolt. Not an ideal thing if you need to dial in your position. Once set though this is a great post.