Suspension seatposts offer great riding comfort as they absorb many of the imperfections on the road/trail. However, using a suspension seatpost will raise the minimum seat height and may not work for riders that require the seat to be in its lowest position.
SR Suntour NCX/Thudbuster ST raises the minimum seat height approximately 3 inches.
Thudbuster LT raises the minimum seat height approximately 6 inches.