Originally Posted by Minion1

the biggest difference you'll notice with Carbon is comfort over longer rides, that is indisputable. i haven't ridden a Caad but really want to, from what I understand of them the engineering is well motivated and well applied, but I would still think a good carbon bike would be more comfortable on longer rides. I have a carbon road race bike and an aluminium training bike, plus an aluminium track bike, and if it was possible for you I'd continue to ride your Caad while you save for a carbon bike. You will have a bit more time to find a good deal, you won't have the pressure of 'needing' to buy a bike because you've just sold your last one, and you'll appreciate the variety of having 2 great bikes when you get your dream bike. That's what I'd do if I could, and if once you've got your nicer carbon bike and never ride your Caad, you can still move it on then.