After 8 surfs with an Ocean Guardian, I am beginning to think it is worthwhile, despite the occasional electric shock. It is possible to turn it down, but that would also reduce the size of the electric field protecting you. The weight of the battery is noticeable, but you get used to it. The best thing about using Ocean Guardian, especially at a place renowned for shark attacks, is the feeling of being a lot safer than if you were not using one. You just feel more at ease knowing that an eventual attack would probably be averted or at...