Acceptable at best.
If you're not picky about your images and just want a light-weight, stylish camera, the DSC-T100 is fine. I just upgraded to it from a DSC-W1, which I'd had for years. I was really happy with my old one and thought the update sounded wonderful, but I think my old camera took better shots. With the DSC-T100, I get a lot of noise in every picture, I get chromatic aberrations around even mild highlights and the pictures also have a lot of "lens bend" to them. In a word, my pictures look cheap. When I looked at people using the same camera on flickr, I saw a lot of the same issues in their shots. If everything I just wrote sounds like gibberish, you'll probably do fine with this camera, but I'm disappointed that Sony put out such a bad camera.