Anyone used these ebay ceramic headers?

I don't understand why breaking in an engine would damage the headers???

-NOTE: Breaking in an engine with ceramic coated headers WILL result in damage to the coating and will VOID all warranties. Ceramic coated headers require several heat cycles to fully cure before they will withstand extreme heat. We recommend using cast iron exhaust manifolds or old headers to break in new engines to avoid coating damage.
 
They look like a nice set of BBK knock off's. I'd be tempted to give em a try at that price if I needed a set at the moment.