I've been happy with my Olympus Tough cameras. I had one survive 3 years of abuse (not just use!) and many drops onto hard surfaces and it finally failed one river trip. I'm a little more careful with its replacement.
I haven't used the Nikons, but haven't heard anything bad about them, either.
It is really nice to have a waterproof camera handy. You miss a lot of good candid shots if you have to worry about keeping a camera dry.