The ones that are GPS encoded are better (accurate) than just a straight 406 MHz beacon.
Smaller the better so there is less temptation not to take it.
Look into whether the batteries are serviceable by the end user as they have a finite life.
We use Kannad XS3, and the GME ones at work. I'd rather have a smaller one for hunting/fishing but my Kannad one was free.
Make sure you register it. I was impressed with that High Country Rescue program with how quickly they got to people with beacons. I think they should be subsidised with how much more efficient a search becomes.
Great peace of mind but not infallible.
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