I have the Z85, and I'm so happy with it. Awesome bike. Great ride, very smooth and enjoyable, plus it is very customizable. If you want to be more upright you can be pretty upright, if you wanna be low you can be low. Looking at the CAAD, it seems like there isn't a huge difference in components. Felt is 105 equipped, FSA crank, carbon fork...its almost like you're paying 500 dollars extra for the same stuff. I'm not very knowledgeable as far as components go so if I am incorrect someone please correct me. But as far as I can tell, you get a better deal with the Z85 because it has the same components for a significant amount less.