I've used www.techlinecoatings.com internal engine thermal barrier coatings on a few projects as well as their external ceramic exhaust coatings (did the exh manifolds, turbine/exh elbow housings & the exhaust cross over pipe). These can be seen on the 2nd page of my album.
They work well, long as the prep, application, & post application polish are done as prescribed. I have never had the nerve to apply their coatings to rod/main/cam bearings. Just couldn't bear to lightly abrasive blast those surfaces as you're supposed to do before application.
I like the appearance, heat resistance, & corrosion resistance of the exhaust product called either Cermakrome or sometimes Cermex. The black satin is supposed to be a better thermal barrier, but it's not particularly chip resistant so not as durable & parts done in black satin are tougher to get installed without nicking them.
Lori at Pendry Powder Coating (some of their listings were on the ebay page your link went to) is a good source for some of the Techline coatings.
If you decide to do these, I can provide some tips on application, polishing, etc.