Also, not all aluminum is created equal. I rode a CAAD 10 (the 5) and it felt better than the Specialized Roubaix I tested (it was probably built for someone who outweighs me by 30 pounds; Spec does size-specific carbon layup, apparently; it cornered like a brick). The guy at the shop said that it rode about as well as the SuperSix (the carbon version of the frame) for much less money. My next bike might well be a CAAD 10.

For some reason, the relaxed geometry aluminum frames seem to be a harsher ride than are the aggressive ones.