My experience with the chromed first stages was two regs where the chroming was chipping off around the LP ports. Not sure if it was a different model or what it was, maybe poor maintenance, but thats how it appeared to me.
My link to the second stage was simply that I see lots of regs that work well in warmer waters, like in Florida, and get away with a lower quality material, but do not work well in northern waters. The DiveRite was an example, where they are well used in Florida but the combination of cold and dropping makes them a bit of a liability up north.
I'm happy to hear that the 1st and 2nd stages are of a much higher quality than I first experienced.