Ron, I agree its a perfectly suitable coating for firearms, just that some coatings in the spray-can aisle at chinamart are just as good and cheaper. CeraKote has a great marketing plan however.
All the testing mentioned above is destructive testing, and the MIL-C quoted is for clothing and IR-signature sensitivity... I figure if Cerakote were the "best" coating, it would be recognized with a MIL-STD and allowed/spec'd on aviation powerplant & airframe components. For a "best" firearm coating, I'd opine Robar's NP3Plus, a high-phosphor base Nickel-teflon coating which is spec'd on ocean-crossing aircraft and 5K PSI hydraulics (F35, B2, A380, etc) and the airliner landing gear your family rides on. Of course it is more expensive and doesn't come in a spray can! ;) To each their own of course! :D