Aluminium shines better than steel, but then I get a great shine off the strut bars, I just don't think they've put enough man hours into it to get to my standard
I've read up on a number of sites these Maz calipers are machine and hand polished, there's no trickery of a powder coated finish believe it or not.
After further reading, the concern from Tim regarding the heat cycles shouldn't be an issue. There's been other DIY efforts which have been successful without issue. So I'm fairly confident these will succeed. I've also read up how easy it is to re-seal them, so I'll be doing that myself too.