I bought that seatpost for a Kona hybrid that I thought was too harsh, It seemed to help or at least I convinced myself it did after spending the £40.!!!
You can see some flex in it, so I think they do absorb some road buzz.
The 07 Allez is advertised with a carbon post but actually has a Alu post with a wrap of carbon , which I thought was a bit sharp of specialized.
I love the bike, I know for a lot of people an Allez is a fairly basic but anything more would be a bit much for commuting and probably wasted on me anyway.