I bought this as a replacement when my old watch (earlier model) became not only discolored but dysfunctional after however many years of being worn in all kinds of conditions, including for working out and swimming.  I looked at a bunch of different waterproof sport watches this time too, but I still like this the best.  I did consider getting another color because of the discoloration, but I'll just have to live with that or replace the watch when the time comes.