I subscription is too expensive in my opinion for most of us unless you are going to be in a remote location or any place far from help, most of the hiking in my state is close enough to a house that someone can get help in a few hours easy, but that is if your no alone, I don't think most people are going far enough away from help to need such a thing, my store REI has only sold 4 since they have come out, most people freek when they find out its $150 a year even if you only use it once.