You only need to use it once if you have an accident in a no signal perhaps remote area with little traffic......
As said, I use mine more for peace of mind for my wife given the miles I ride, sometimes in areas where there is no mobile service.....
Having had one accident where I ended up off road down a bank, at night, due to ice, I was fortunate as someone stopped to investigate the strange light, my bike!
I had no mobile service and it was somewhat cold.... my injuries meant I could not walk and it was a bit of a climb back to the road!
Spot would have been a life saver had my situation not been resolved!
Of course the bonus is the support for IBA ride verification, receipts still required of course!