I've been abusing my Casio G-force military concept watch for about 2 months now and it still looks and performs just as the day I bought it.  Some of the activities I've done while wearing this watch include: swimming in a pool treated with chlorine, car washes, surfing in saltwater, playing softball, and the list goes on.  Not only is this watch extremely durable, but it also has killer looks.  I really love the simple, flat black band and the black screen with orange/red numbers.  Although a bit pricey for my taste, I am very satisfied with this product and I do believe it is worth EVERY penny.