I have a RX100 - it's my underwater camera as well as something I can easily carry around when I don't want or need the D7000. Previously I used an older Canon P&S SD970IS. I haven't taken the Sony underwater yet, but the land photos I've taken are quite good. I really like the camera and how easy it is to operate. I also have a Nikon S8000 that I may give to my parents or sell, as I doubt it'll get used much now.
If you have any specific questions, I would be happy to assist if I can.