Dallin O.wrote a review of SPOT Satellite GPS Messenger on July 28, 2012
I used this while floating 600 miles on the Yukon River in Canada/Alaska. With a touch of a button I could let my family know via email where I was and if I was OK. I never used the emergency button, but it was a huge comfort to myself and my family that I could have help if I needed it. Bottom line: If you spend time in the back country, this is something that can save your life.