They were all done by Tripp - I asked for a "matte" hard chrome - I didn't want it shiney.
The extractor and the decocker on the P99s were all covered in his black polymer.
The hard chrome wears extremely wear - after 2 years on my P99c which I carry everyday - NO holster wear.
But, Tripp also messed up the finish on a 1911 a couple of years back. And, even after giving him a 2nd chance to fix it, I wasn't happy. His quality control is spotty. And, on that 1911 - that black polymer coating was terrible - even after 2 tries.
Be aware that all polymer coatings don't wear that great - so if U wanna carry a gun, hard chrome will be the most wear proof - even over NP3.
I can't really recommend Tripp after my experiences, though. I've never tried these guys, but have heard good things. If I ever hard chrome something again, I think I'll try one of these two...
http://www.originalmetaloy.com/
http://www.fordsguns.com/