Quiet and smooth are not good enough for me. By my curious nature I need to know what is the product made of and what is the mechanism that makes it work. I read through some of the links:

"Cerma ceramic metal treatments utilize the metal of the current conventional engine design, Cerma then impregnates the metal with micro particulates of ceramic lubrication, Cerma then requires the existing carbon & acids within the engines oil to complete the transformation of Cerma products to a smooth ceramic seal within the metal back bone of your engine."

The vernacular of the above statement sounds suspiciously familiar, like something I've heard from other snake oil salesmen, and not from someone who is technically proficient... those are very hollow words.