Oh- I have a new one:
I'm on my third front-center jack pad. It has failed on me twice now, and the second time could have done some damage if I hadn't put a jackstand under the left front pad about 10 seconds earlier.
As you know, it's sticks into the front subframe. Make sure to jack in a perfectly vertical motion and definitely make sure the jack is centered on the pad. I think mine got twisted slightly a few times from not being perfectly lifted- it's just plastic that sticks into the subframe, not metal.
I will eventually just weld something on the subframe as a permenant jack point.