I need a new seat post

Can someone tell me why one would by a 90$ Nitto Crystal seat post like this? As opposed to a cheaper one from a LBS?

What would a upgrade do?

Lighter?

Absorb more shock then other material?

Just to be cool

thanks

http://www.velo-orange.com/nidy626secrf.html

http://www.rivbike.com/products/show...eatpost/11-031