As I am normally responsible for the safety and security of others when I am out, I carry both a PLB and an inReach 2 way communicator. These are not considered a primary option for safety or communication, but supplement the plan. There is always a good plan (think PACE), proper equipment (including visual signaling and cell phones) and training for the environment and how to survive there.
I have used the inReach to track students and communicate out (when there is no cell phone signal), but have never had the need to use the emergency signaling capabilities of the inReach or PLB. Even though we have at times dealt with bad conditions, injuries and potential emergencies, the plan and other equipment always got us through it.
It is nice to know I have the emergency signaling capabilities though.