I bought a S90, but I have large hands, and had to hold my finger such that I could push the buttons with the edge of my fingernail, and then, it took several tries to push it correctly. My fingers kept covering the lens when I held it, and when I did take some photos under incandescent light that normally come out fine with my DSLR, the color was horrible and hard to correct.
Outdoors in bright sun, there was no way to fram a image, just point and hope you got something. I'm glad that some are able to use it, but its not for everyone. I have a little trouble with my wife's G12 in pushing the control buttons, but It has a viewfinder, and the fold out lcd let me hold it high over my head at a outdoor concert and take photos that were not blocked by the big crowd in front of me. It was a overcast day, and I could tilt the display until I could see well enough to frame the photos.
Be sure to give one a try if your hands are large, and don't expect to use that lcd display in bright sun.