The CAAD 12 frame rides very smoothly, much more like my carbon bike rather then my other aluminium bike.
I bought it as a lighter and faster winter / wet weather bike, but it gets the most use of all the bikes I own.
Last year I completed the double Dunwich Dynamo (224 miles) on it, complete with all sorts of bars and snacks taped to the frame in various places. The bike did well, I was a little sore in wrists, neck and backside. But that was only after 170 miles. The bike did well