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Last year I bought 2 of the Mustang MD3183 as mentioned above.
These are considered "expensive", but the quality is clearly there.
They are HYDROSTATIC activated, or need to be submerged in a couple of inches of water to activate. Large amounts of spray or super high humidity will have no effect on these PFD's, like the one's that dissolve a "pill". But, you can still activate manually at any time.
The Mustang 3183 is truly comfortable, which is the key to having it being used.
Quality costs more.
I searched for several weeks online until I saw a great price, and pulled the trigger. These are the best available, and worn by the professionals.