I haven't used the PLB yet but I use the InReach a lot when I hike the Catskills and the Gunks in NY. Cellphone reception is impossible in the Catskills, so I use the InReach for texting my wife.
For the PLB, I have seen someone after they fell during a rock climb and later died. It wasn't pretty. I wonder if faster emergency assistance would have saved her. I think of that when NYC'ers come to the Catskills and hike in flipflops or have zero water with them on a 6 hour hike in the middle of July (true story!). By having 2 emergency communicators, I can assistance with one, and communicate with another - or give one to a party in distress.