I've used them and I see them all the time on the 3D courses. Not that I shoot them anymore. I may sound a bit biased but you're the one who asked.

PRO---Camo arrows look cool.

Con---Camo arrows cost more.
Harder to pull from 3D targets
Heavier than the same spine in black (slows the bow down)
Noisier drawing across a rest

How much more do you want me to list?