figured I'd share this (originally from a post elsewhere on the site) even though I hear a lot of people happy with their SPOT I wanted to send out my two bits on this device;
I just got a SPOT and formerly had a worried wife, now she watches my movements (spend the money on the optional tracking feature) via the spot as we move. I send in "OK" messages before I camp for the night and when I get up in the AM.
I'll be glad to share a website after this weekend (and a trip to Valdez) due to having sheep scouting trip on the latest shared site, I'll post a link for a limited time when I get back (not fishing any secret hidey holes).
Biggest reason I got one; the spot is actually cheaper now than what I had been spending every year on sat phones, my plan runs $157ish a year for basic service, tracking, and rescue insurance (they are selling the SPOT at most locations with a 100% mail in rebate).