Experience with ProAct implants (an AUS) for incontinence?

Interesting question. I'd never heard of the ProAct.
I've had an AMS 800 artificial sphincter for 6-months now and am quite satisfied with it.
I did some web searching and found the ProAct web site and it had some reference studies listed. I brought up one and it seemed fairly complete.
So not as to prejudice you or your friend I'll suggest you do the same.
FWIW here's the link to the study I found.
https://pubmed.ncbi.nlm.nih.gov/32249971/
The other studies should provide more info to help you.
Good luck to you, your friend and support group.
bob