I love them for working watches. We had one diver drowning his orange monster on a job, due to forgetting to screw the crown in after re setting the time. Movement was poked so the movement and we strapped the empty re sealed monster to a ROV going down to 600 m. It's came up dry inside. I was very impressed. For a watch only rated to 200m ! Very good bang for the buck. Now I just hope at some stage they are going to make a bigger version!