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Carbon will be more comfortable than alu seatpost, weight isn't important in that area (like handlebar and stem).
Just be wary of cheap carbon post that's doesn't really do much/usually wrapped on alu.
Carbon grease is necessary.
Do you need the exact same setback?
edscoble-
Carbon will be more comfortable than alu
Unqualified, that's definitely bullshit. Even if you knew that a given carbon post had less bending stiffness than the aluminium one it was replacing, the difference would be pretty small. If you want to get comfortable, get your position, saddle and tyre section/pressure right and you won't have to looking for marginal gains from bendy components.
gbj_tester
Thinking of upgrading the seatpost in my aluminium Canyon (Roadlite) from the stock aluminium one to a carbon one. It's by no means pressing, but I've found what seems to be a bargain.
Weight is my least important criteria and I'm not sure of the exact weight of what I have, but from looking around a few sites, it seems to be around 230g, whereas the replacement I'm thinking of is in the region of 160g, so let's say 65g saving, give or take.
What's more important is what kind of improvement it may have in terms of ride quality and whether or not that is going to be offset by any increased maintenance - what is the current wisdom on carbon post in an alu frame? What, if any grease/compounds are required?
Here's the post in question, which is half price. The current one is a Ritchey WCS aluminium one.
http://www.wiggle.co.uk/ritchey-wcs-carbon-seat-post/