The Synapse has been out about a year. Its Cannondale's first full-carbon frame. It has had absolutely rave reviews in every mag going ( I have read US, UK and Aussie reviews) They say it is responsive and accelerates like a thoroughbred racer but has a slightly longer wheelbase which makes it less twitchy and has a slightly more upright riding position for all day comfort.

It is my next Dream bike at present so I have looked into it quite extensively!
Whan they say the dimensions are so and so to give this and that; they are really only talking about 5mm here and e degree or two there, so I don't think you would be snubbed in pure racing circles, should that bother you!?

Regarding comfort in the racing bike?
Well, I have an up-right which I still use for commuting (but not for long) and my current Cannondale R800 (CAAD 7 frame which I love). I have to say that I am much more comfortable on my road bike and can happily ride it for 6 hours without stopping. I only ever get numb hands and neck pain on my up-right so I am a complete convert.

You have to remember that road bikes are designed for riding long and hard and they are good at what they do. You have many more handlebare positions and even saddle positions on a roadie.

It might not feel instinctive, but its worth persisting with.