No, although I've only ever had (and still have) one prior guitar with gold hardware, which is a Fender Strat, and on it it is everything but the pickups which are gold plated, - and are all solid as a rock. Chrome hardware, - no real problems aside from sometimes a tiny bit of bubbling/corossion with age, and one Godin where the covers had some god-awful black/oil-sheen effect over chrome which wore off pretty quick, and bare nickel covers which have gone a bit green. Even with these humbuckers, it's only one which the gold color has come off on!
If these are genuine Dimarzio's, my only gripe is that they should say in advance what the gold coating is, - plate or something else, because if these are genuine, I'm probably looking at having to either strip them down and have them gold plated, or trying to return them and looking elsewhere. I kind of wanted to be at least semi-authentic for an early 80s build, I know Dimarzio was doing gold-bolt humbuckers in the late 70s, and six hole gold covers; I'm not too sure if Dimarzio was actually doing 12 hole gold covers at the time, - and strictly speaking the pickups should be something like Super Distortions, but overall I figured the Titan's were a good nod towards authenticity while otherwise being what I wanted.