I have a T30, after play with it for a while i found the following.
1. If you can hold camera very steady, i found "continue" IS works better than "shot only" IS 2. If you want big aperture, use "soft snap" mode. The camera will use the biggest aperture available.
3. If the person doesn't know how to "half press" to focus before taking shot. You can change the focus to "continuing"
i think it's a pretty good everyday DC. The image quality is only average. but good enough for social shots.