PLB reliability

If PLBs/ERIBs were unreliable they would be not be mandatory fitment to most aircraft and commercial marine vessels.

I do not think you have any worries with a PLB that is correctly registered with AMSA.

Garry

hi noldi
I have been told and also observed for myself that opposing sales people get on these review sites and write very negative reviews about the other brands
to promote their own
Ive read thousands of product reviews on many items and sites
and have discovered that there are simular phases and terminology that is repeatedly used by the same knockers under a different guise/name
in order to boost sales on their own products
so as they say-- you have to read between the lines
what you have quoted about the plb sounds very much like it
cheers

A PLB has half the guaranteed run time of an epirb (24 hr vs 48 hr), and has a lower current signal which is not attenuated by water unlike an epirb's. Having said that, you can't stuff an epirb in your pocket and go for a jog.....
Horses for courses mate.
If your particular PLB is also GPS enabled it would make it a much better proposition than one that is not, but a standard one is also about a million times better than nothing.
Whichever one you have, carry it with confidence for you terrestrial activities. Epirbs are the go for offshore though, no question, but I'd have a plb in my pocket there as well if I owned one.
As a side note, if you are planning some super remote/borderline activity, call AMSA before you go and tell them where you are going to be before you go. They like that.