I haven't exactly driven mine a lot, but the ceramic coating is still flawless. I periodically hit everything with the laser thermometer and notice that the temps directly on the headers, and even right up against the heads are ridiculously low for what I feel they should be, all things considered. I'm not 100% sure, but I'm thinking temps in the range of 160-230 (at various points on the headers themselves) either means that the ceramic coating is doing its job, or all of the laser thermometers I've used to check on it are all broken with the same issues (at least 3 different units). I would imagine that the headers should be significantly hotter, with the temps dropping off slightly as it gets further away from the heads.
This is my first set of ceramic coated headers on a car I own - but I'm a believer! ::thumb::