Why the need to taper the seat tube?  Can't possibly be that much weight savings.  My problem is that any carbon 27.2 seatpost I use flexes tremendously while riding.  I am 6' 4"/190lbs and just got myself the 2010 R3 (size 61) which comes with the 3T carbon post.  It flexes like a sapling in a high wind.  Tried a Richie seat which I have been using on an aluminium Orbea for years and that also flexed on the Cervelo.  Had no choice but to revert to an old trusty Thompson post.  Why change?  I fine the bigger seatpost actually look better than the skinny 27.2 and are probably much stiffer/stronger.

Other than that, I love the bike but may not have bought it if I knew that beforehand.