I never notice the infamous Alps wobble, though some people do pick up on it.
I have the same complaint about the rough feel, but at the same time, I was impressed by the weighting: neither too stiff, nor too light. I don't recall getting any fatigue from them, nor would I imagine any reason for it considering how light they are (but not too light, like Cherry MX). I don't have any serious complaints about off-centre keypresses, but you're right in that the design can struggle a bit with that.
I forget how long I used my Quiet Pro before I went back to Filco — probably several weeks, in which time I don't recall noticing any change in feel. Someone else in the office has it at the moment; I should borrow his PC and see whether the feel has changed, although he doesn't do the amount of typing that I do.