I have several, and so far the buttons still work on all of them. One thing I have noticed, and it may just be a problem with the one example that I own, but the gold ones seem to be more efficient than my nickel-plated PB.
That's interesting. I suggest that is a placebo effect or something else psychological going on. A gold colored versus a "silver colored" razor of the same model will shave identically. The face doesn't know or care if the razor is gold or silver or some other metal.