Some people prefer to stick with the plastic props, personally I prefer CF. You have to be careful which CF props to use, there are many cheap imitations out there. Many from China are merely Nylon props coated in CF resin. They're stiff but the ends still flex. I use ARRIS 9443 non self-tightening props as they are solid CF & don't bend at all. I use prop nuts & blue Loctite to ensure the nuts don't come loose. (don't ever use red Loctite, you'll need an oxy/acet torch to get them off). They will require balancing before flight. I have placed a link to a video of the method I use to remove material from them. However, I use a Dubro prop balancer, not the tiny little thing the guy in the video uses. I don't believe props should be sanded as it alters the shape of the surface of the prop & could alter the way it's designed to move/direct airflow & a 'rough' sanded finish may reduce the drag co-efficiency of the prop.
It is worth noting though that CF props are very sharp and unforgiving & have the potential to cause serious injury. You need to be very aware of where you will be using them and the potential risk if something should go wrong. I still use the genuine DJI plastic props if filming in confined spaces, near stationary objects such as walls, as CF props will shatter like glass if they come into contact with a solid surface like concrete.
http://www.youtube.com/watch?v=a3Byk8W5P_E
