I have a 2011 6 series frame and it is flat out the best frame I have ever owned. Fantastic blend of stiffness and comfort. My prior bike was a Cervelo RS and in my opinion, the 6 series blows it out of the water (as it should). The only thing I would give the RS over the 6 series is it might be just a little more comfortable over real rough roads, but that is marginal at best.

I will agree with everyone on the Trek logos. I have 14 on my bike and while I have gotten used to it.. It is indeed a little overboard.