Seatpost Thomson --> Extralite

[the BRAIN]

Hi!

I want to lighten my Bike (Specialized S-Works M5) and so I have a question concerning the seatpost. Is it worth the money to change the Thomson Elite seatpost to the Extralite seatpost. How much weight can I save? (40x30,9)

Thanks!

[babar]

I have one for my FSR S-works.
the lenght of the extralite is 380mm in 30.9 and the weight is 216g vs 240g for the Thomson cut at the same lenght