I had a CAAD 8 and loved it.
It is really designed as a race bike, being very stiff and quick turning. I did some longer rides on mine and it was comfortable, but I wouldn't pick it as an all day bike, or more of a leisure rider.
That being said:
Try it out, if it fits nice, and is comfortable to you then go for it. Nothing anybody says is going to change the way you fit and feel on it.