There have been some very good reviews for the RX100. I like this one because it tells you both the good and the bad, and there is plenty of both.
As far as ISO 3200, its noisy compared to a APS-C body, but better than a tiny sensor like the G12.
I've been wanting to get my hands on one to take some test shots, the local camera store has not been able to get them and now I'm waiting for my hand to heal.
I have big hands, and very little sensitivity in my fingers, so a tiny camera might not work well for me.