I have the Optio S.
Great camera in that it has excellent features, very easy to use, and all around well designed.
However low-light image quality is abysmal, and image quality in anything less than bright outdoors leaves something to be desired. IMO my Canon S100 had better image quality.
However, the fact that it's compact enough to fit in your pocket, an altoid tin, or a marlboro pack more than makes up for it.
If you're interested in it, I might sell mine.
