Do any of you who fly fish using an 'automatic' PFD? I'm thinking about getting one instead of the manual waist belt PFD I've used over the years just as an extra precaution at my wife's request.

What I'm not sure of is if because they are apparently so sensitive to getting damp/wet, whether any spray from rapids, etc, might tend to set them off when you don't want them to.

What say ye'? Are the automatic PFD's more trouble than they're worth... or worth their weight in gold... be it on the stream or in a boat?