I Bought this camera for our holiday in mexico, with a case and 16gig sd card and spare battery cost me about £325 as i bought them all seperately,and when the camera was a new release. I could not find the right deal at the time to buy the particular items i wanted together. Bought the GPS version and also wanted the green colour which i think looks great. A 16 gig card will hold thousands of photographs at maximum resolution or a couple of hours of video at 1280x720, do not buy cheap sd cards as they will take a long time to store a 14mpixel photo, and will not work well with HD video. At 14mpixel the photos are usually between 3.5 and 4.5 megabytes each photo. The Transcend 16gig class10 work well, but if you can afford it, get the Sandisk 16GB Extreme class10 SD.
Picture quality is good but i found that green colours tend to look a little brighter in the photograph than they were in real life, which is not such a bad thing as they can make outdoor photos a bit more vibrant.
I did use the camera down an underground cenote (sinkhole in limestone rock) swimming in fresh water, also used it to take photographs on a sea bed walk while wearing a diving helmet, at about 12 to 15 feet deep, and while underwater changed camera function to underwater video and got some good footage of the tropical fish and the stingrays upclose. Camera worked fine through the whole trip except for the GPS, which did not want to find a lock in mexico, although it worked well in England.
GPS flattens the battery quickly, especially the tracking function, but with GPS function turned off, the battery lasted four to five days and about 75 photographs or more. Zoom quality is good and with resting my arms on a rail, managed to take a shot at maximum zoom without shake on the picture. I did find the face detection a litle annoying at times, as i had to cycle through this setting to either make it see faces, or turn it off because it focused on the wrong place.
Overall the camera is easy to use, has a lot of functions, including sound record on HD video, and will stand up to the general punishment that an outdoor adventurer will put it through, and image quality is a big improvement on the cheaper 14mpixel camera you can buy at the local supermarket because of the quality lenses and sensor fitted to this camera.
Would i recommend the Pentax Optio WG-1 GPS?, of course i would, but the cheaper model without the GPS is probably the one to go for, although it does look good in green.