Quoted from PinballAlley:
Here is what I know. I want to say that I have not had issues with any of the machines I had sold. This is in no way a denial that issues exist. It just speaks to luck and that the problems were limited in scope. Stern has assured me that they have a handle on the problem. That any pinballs coming should be problem free. I asked them straight out. I also asked what if problems arise from machines already sold. Stern informed me that they would take care of the issues via distributors.
The other point I want to make is that these issues seem to be limited in scope. It is not widespread failure but instead a small percentage.
In these sales pitches you constantly put out you also stated you only sell a handful or Stern NIB a year so you're really not the guy to comment on how many machines have PF issues, etc. You stated you are more of a "restoration" guy and that's fine.
And of course Stern will tell you what you want to hear. Until we know more the suspicion is that only the worst examples will get a populated PF swap... the rest of the guys with multiple ghosting inserts, etc may be out of luck. We'll see.
I just got a TWD Prem 4 months ago so I'm hardly a Stern hater - quite the opposite.