CNC ported heads always get good reviews, anytime more air goes into a motor it's good. I am going to get the Ford Racing heads and cams because they're new factory castings not old junkers that were ported by others and there is no core charge. The heads and cams are a great foundation for future mods such as turbo or super chargers or larger cubes.
They are a good investment if you want to go balls to the wall with a blower, supercharger, or even a stroker. Personally, I don't think they are worth the money unless you have already done everything else that can be done.