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Noticeably so, can be further improved by having a decent carbon seatpost.
The new 2016 Cannondale SuperSix now come with a 25.4mm seatpost, the previous Supersix have 27.2, further back to 2013, it used to have a whopping 31.6mm.
Oversized = stiffness usually, useful for frame, bar, stem etc. but with seatpost, you don't want to feel every small vibration travelling up your backside.
Does it work then? It just looks... cheap.