Prior to a 2 week dive trip to Bonaire in Sept my buddy and I each bought a Go Pro Hero black, with all the accessories. (You will want the LCD backing too). First dive everything was fine. The battery lasted 30 minutes. So neither of us could use the camera on the 2nd dive. Next day, we both decided to keep it turned off till ready to use. When that moment came at depth, I was horrified to look at my camera and see it was flooded. What a cooincidence. So was my buddy's. We rented a Olympus TG2 for two days at $50/day, and just relaxed without a camera for the rest of the trip. On the plane home my seatmate mentioned her husband's GOPro ALSO flooded on the 2nd dive. Cooincidence? Now I've been home for 2 weeks trying to deal with Go Pro. At this point they have offered to let me buy a new camera for 40% off. I really will not put any more money into this set up, and hope to get the camera, housing, and LCD completely replaced. Then I'll sell it all. We'll see how that goes.
So be careful. It seems to happen at depth, no matter how much you test it in your sink.
The rental camera, Olympus TG2 took far superior Photos. My buddy has already purchased a new TG2, and says the heck with the Go Pro. Honestly tho...if you could see the Go Pro pics from first dive compared to the TG2 it's a no brainer.