If anyone is using Hooker headers w/ Hooker's ceramic coating, how are they holding up over time and are they good at keeping the heat in the pipes?

i had hooker competition ceramic coated shorties on my 84, and they held up really nicely. it rains quite a bit in the spring here, and they just got slightly hazey after that, but still had that nice silver color to them. im going to use them on the 91 after i build the 383 for it. hooker is a really good set.