Bought my RX100 last Thursday. It's mk1 or whatever, not II or III or m-anything. I was trying to save some money, while still getting a well-rated camera with the 1" sensor, hence not the later models. My previous digital cameras were cheap P & S or phone camera and I was totally aggravated the low-light performance and graininess - hence the desire for a larger sensor. After reading here, and being totally baffled by the manual, I bought the book "Photographer's Guide to the Sony DSC-RX100" by Alexander White - that helped a lot. First major shooting was Saturday, a kids party whcih was my "excuse" for buying this thing. Used the I-Auto a lot. Used P-mode to boost to ISO ( 800, 1600, 3200) for indoor existing light photos. I learned that next time, I need to set the auto-white balance in P mode. Still, no disasters. ISO 1600 is AWESOME!!!!! 3200 ain't bad either.