I was hesitant to get some AF1's due to all the pivot cup issues but I found a paid that had perfect pivot cavity in the baseplate.
After 6 sessions, the cup ripped and suddenly there was now a small divot in the cavity in the exact spot that others posted. I put a new cup in and it ripped in 1 session.
As far as I'm concerned, these things are flawed from a design/manufacturing perspective. Save your money and avoid the headaches