I dont know about the CX, but keep in mind that the CP or CP Pro will "loosen up" after a lot of use. This will make it sloppy and a lot harder to control.

On the other hand, if this happens, you can replace out the problem parts. If you are new, you are probably going to be replacing them when you wreck anyway.

I actually had a very good experience buying my second CP Pro used for $150. Another guy in a hobby shop said it flew terribly and that he was buying a T-Rex. So i bought it cheap. When I got it home, I followed the instructions on bladecprepair.com to readjust everything from the swashplate upwards. In the end, it flew better than my original blade.

Hope that helps,
Danny