I got a 1000c for a starter road bike. It came with a suspension post. First problem is not necessarily the post but me ... I'm heavy and the post is "preloaded" almost all the way when I sit on it. Secondly, I think after a while of riding, it compresses even more ... almost to the point it's bottomed out anyway. This compression changes the seat to pedal distance slightly I'm sure.
So ... either I need to loose about 40 lbs or get rid of the suspension post ... or both.
Good Luck,
d.tipton