It is always somewhat confusing for me to read these stories of Spot failures. Which, by the way, I don't doubt. However, it is generally difficult to discern the underlying factors in the failures themselves.
I've always wondered how PLBs would stack up if they were used in a similar manner. Thankfully, most people I know with PLBs never use them, ever. My Spot on the the other hand will send hundreds of messages on a single trip. The tracking feature is the reason I bought the Spot over a PLB. Most people automatically assume they will be able/alive to activate their device. Sadly that is not always the case. Right now in Utah there is a solo hiker missing in the Uintah Mountains that is carrying a PLB that is several weeks overdue. Surely if he were able it would have been activated.
My experience with the Spot 2 in Utah and Colorado has been very good. While I don't log/track every single message sent, especially in tracking mode, my success rate has to be very near 100%. In fact, I am not aware of any OK or custom messages that haven't gone thru.
As always YMMV.

