Here is a large collection of PLB success stories at ACR's website. There are plenty of lessons to be learned or reinforced. Some of the stories reveal mistakes made, and some (IMO) didn't really justify PLB use. But then maybe not all the pertinent info is there, and not everyone is a meticulous narrator. A few include web links to news reports of their ordeals.

As with the AAC's "Accidents in North American Mountaineering" there is value in studying the misfortunes of others.

Disclosure: I have no affiliation with ACR, though I do carry their Res-Q-Link PLB. I happened across this page at their site while getting info on replacing my PLB's battery.