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hugo7-
Why?
Very few of them are any good. The odd ones which are are expensive, and the only benefit they have over metal ones is lighter weight. Sure, if money is no object knock yourself out and spend an extra £100 to save 50g on your weight weenie bike, but if you think you're going to get comfortable by changing the seat post material, check your position and tyre pressure instead, it's free and actually works.
gbj_tester
Don't