Rating: 4 / 5
I very much like my Optio WPi (6 mp). I have found the waterproof feature to be of much greater value than I originally expected. For winter pictures, it is really handy to set up a picture and not worry about dropping it in the snow (or having slush fall into it, etc). I've taken quite a few pictures with it. You can get a good idea of it's capability (in the hands of an amateur) by going to my flickr site at http://www.flickr.com/photos/rossbl. I especially recommend looking at the landscapes at dusk, http://www.flickr.com/photos/rossbl/sets/72057594086466307/ as well as the close up flower pictures, http://www.flickr.com/photos/rossbl/tags/wildflower/ and the pictures I took of one of the most photogenic spots in the world, Antelope Canyon, http://www.flickr.com/photos/rossbl/sets/72157594146652113/. With all of these pictures, I recommend clicking the pictures, then click on "all sizes", then "original". You will have to scroll the picture back and forth, but you can see the detail that is possible. I am especially happy with the close up flower pictures.
Room for improvement: It would really be nice to have manual control (exposure time, etc.) in this camera. Of course, I don't know of any camera in this weight range that has this.
The biggest drawback is the lack of a viewfinder. If it had one, it would get a five star rating. There are too many times where I can't see the detail of what I am taking. I have to "shoot blind" (e.g. I can't see the mountain in the distance, but I can tell the nearby ridges are lined up, so hopefully it is framed fairly well). Plus, this may contribute to battery usage. I have run out after 100 or so pictures. This was in the winter, so I may be able to take more pictures in warm weather. I definitely recommend buying an extra battery (or two) for long back trips (unless you take fewer pictures).
All in all, this a great camera; I just wish it had a viewfinder (I would gladly pay for an extra ounce or so).