Thwack (or others who've used the Pentax Optio) have you used this camera for any action type shots, especially in low light? I need to replace my Canon Elph, which was stolen a while back. I like the thought of having a waterproof camera. I also use the camera for taking photos while out mountain biking, though. I need something that handles faster shutter speeds at least decently.

Off to go read some reviews on this camera now....

~Matt