We recently purchased them for both of us. Bought the wife a BP brand which is made by Onyx that uses the dissolving pill to activate. I chose a Mustang Elite 28 which needs total submersion to activate. I fish in all kinds of weather and she is a fair weather angler. I didn't want to take a chance with rain or humidity setting mine off. We keep these things on all day and honestly, I forget it is on. I too worry about slipping or falling and taking a smack to the noggin' or landing in frigid water and going down for the count. Too many stories of folks drowning and life vest were nearby.