I've had my G3 for about 10 months now, and I've taken thousands of pictures with it. The positives:
- Takes great, clear pictures under ideal conditions; often with better results than my 35mm Canon SLR!
- Easy uploads to my PC.
- Accepts my external Canon flash.
- Excellent battery life. (I've people complain about battery life with other digital cameras, but this really is a strong point for the G3.)
- The unique LCD that flips over is "cool" (and easy to protect from scratches).
- Has lots of shooting modes for a non-pro camera.
The negatives:
- The lens cap is a poor design; it falls off very easily (at least Canon provides a cord so it doesn't get lost).
- Focus is slow except under ideal lighting conditions.
- Focus is unreliable; I've learned to take 3 shots at a time, hoping that at least one of them will be in sharp focus.
- Photo quality gets noticeably worse (more "noise") as soon as you increase the exposure "speed" above the slowest setting (ASA 50).
- The design is relatively bulky and heavy for a non-SLR camera, and the controls are not ergonomically correct.
- The RAW picture format option is useless with this camera because Canon's software gives you virtually no useful options for correcting/modifying photos in RAW format. To do anything useful you have to take the time to convert your photos to JPG anyway. I gave up on RAW after the first couple of tries and have stuck with JPG format since then.
In summary... I expected a lot at this price level, and the G3 really is a great camera for family snapshots, scenery and documents. However, it is a poor camera for low-light conditions or action photography.