I bought a SPOT last year and used it on a September trip.  Once or twice a day I would set it out to send a signal.  It worked every time.  It is a lightweight way to let those at home have a little peace of mind.  

I usually trip with 2-4 people but in the event that I could only arrange to go with my 11 year old grandson, I would not hesitate.  The SPOT is just a little insurance.  

I didn't go back and check the fine print but I think the 911 button works on any subscription.  The TRACKING feature is an upgrade.

terp