Calfee will also let you transfer a warranty. So if you plan on buying used, you can warranty it. I have bought two used Calfees and haven't any problem with either of them.

Something else to consider--what fits you.

Different bike manufacturers use different geometry. For example, I know that I need a tall head tube or I will have neck pain. If you are buying new, Calfee can build you a custom carbon frame, if you need it most people don't. Custom carbon frames are rare amoung bike manufacturers.