I am a part time professional photographer. My wife and I were going on a cruise and we had planned some underwater activities. I wasn't going to take my working camera for a couple of reasons. So I looked for an underwater camera.
Since I am mostly a Canon guy, I checked out to D10 and D20. Because of the features, especially the zoom, I decided on the D20.
What a great camera, easy to use, takes great pictures.
One flaw that you need to know about so you can overcome it is; The lens is right near the top of the camera and I didn't notice it while taking my test pictures because when I was not in the water I held the camera different than when I was in the water fighting the currents.
Once I noticed what I was doing, it was easy to correct. But it seems that Canon could have put the lens a little lower to avoid this problem.
You can see the attached picture to see the quality of the camera and my finger on the top left covering part of the picture.