Yep, there are lots of thoughts about them.

The main source of Doug’s thoughts can be found here. (Make sure to read the updated articles as well; links are on the page.) For other people’s thoughts, there are several threads on the board already about the SPOT Messenger.

Oh, and no, it is not a PLB.
_________________________
“Hiking is just walking where it’s okay to pee. Sometimes old people hike by mistake.” — Demitri Martin