Summary: Nice and solid, takes decent photos, has a good interface. Loses date and time info when you change the battery which is a pain and have to remove the SD card to download the photos but ok for an older design.
Summary: I bought this camera after I lost my last digital camera and, while the Pentax doesn't offer shutter- or apeture- priority modes, I realised that these were features I rarely used in the past. The size of the camera is brilliant (about the size of a deck of cards) and the time lag between shots is very good (1 second or so).
Summary: I have owned quite a few digital cameras, all of which seemed to have followed the rules of 'technical tradeoffs': If you want quality, you pay more and you lose form factor. If you want form factor, you pay more and you lose quality If you pay less, you lose on both quality and formfactor. And so on and so on. Knowing this, I bought this camera for its form factor and hence did not expect the highest quality pictures. Nonetheless, it has impressed me.
Summary: Just purchased the pentax optio s5z and very pleased indeed with camera. I'm not the most technical person but have found it very easy to use. The instruction booklet is very clear and describes all the features well. I'm also enjoying the movie mode (taping golf swings). It plays back on my tv with the supplied cables. Picture quality also good.