Anyone here use the Biologic Suspension Seat Post on their Curve? I'm thinking about it and don't really want to drop the $140 for a Thudbuster. Does it mount on the stock seat post or do I need to buy something else? Is it easy to install? Does it make the seat sit higher than stock?

http://www.dahon.com/us/accessories/...suspension.htm

http://www.thorusa.com/dahon/accessories/seatpost.htm