I do have one but have canceled the subscription, the ~$250 yearly fee is a bit over the top. My opinion, but yes it could save your life.
100% agree. To those who have commented on sat phone reception being unreliable it depends on which of the two sat services you select, “GEO” or “LEO”. The appropriate service will depend on your intended location. Correct me if I’m wrong but I recall that LEO provides the best coverage away from the equator and “GEO” closer to the equator. Annual service cost on a prepaid plan is less than SPOT assuming you only need the service for no more than 3 months of the year