Teflon is valuable in detailing which is restricted to surface smoothning and adding lustre but will not protect at all.
I know that Tenneco Automotive are licensed to make this stuff and the paint protectant has ceramic in it. The Ceramic from what a friend of me told me is an excellent protective product and the teflon helps prevent fallout and other road grime from sticking to the paint because it makes the surface super slippery.
As for the other products, I am not so sure.