I am a huge fan of carbon, my bike is carbon, the handlebars and even the wheels have carbon spokes; but, the seat post is one place where I prefer aluminum or titanium. A Thomson Masterpiece aluminum seat post is as light as any carbon seat post that I am aware of and more durable. The clear coat on the carbon seat post will scratch really easy.

Even Craig Calfee, the Jedi Master of carbon fiber recommended that I buy a Thompson aluminum seat post.