Summary: I have used a K100d for several years and been very happy with the camera. I wanted to upgrade to more pixels and faster burst speed, but did not want to obsolete the lens, flash and other accessories I had accumulated. I initially considered the K200d, but at $700 - $750, it did not seem to be a good value. At $470 at Amazon, the K-x was a very good value. There are many full reviews on the web, I'll address only the "negatives" these reviews mention.
Summary: I have owned a Pentax K100D for over three years and acquired several additional lenses. Building on my earlier investments was important to me. While I have not really explored all the new features of my K-x, these are my initial reactions. The Kx is marginally smaller. One of the features that I liked in the K100D, a separate settings display panel has been removed. It did not take long to get use to activating a settings display on the viewing display panel.
Summary: I replaced my Minolta digital P&S (given as a gift nearly 10 yrs ago) with a Pentax K-x white just before the holidays. I went with Pentax because I was very happy with my past Pentax cameras (all manual K1000 ages ago and more recently a PZ-1) and I wanted to keep using a couple of good zoom lenses I had for the PZ-1. Two additional requirements were the DSLR be capable of movie recording and be no more than $750, preferably around $500.
Summary: Pentax Kx is Pentax digital SLR for beginner and enthusiast. Pentax Kx replaces Pentax KM / K2000. There are many improvements from KM, such as three stops higher ISO setting, video recording, faster continuous shooting, 11 selectable auto focus points and 12.3 megapixel image resolution (compare to 10 mp). Kx shares same body as Km, so it is still very compact but not weather-sealed like Pentax k200, k20d or k7.
Summary: I recently got the Pentax K-x in Black from Amazon. It arrived in only a few days, and Amazon provided me with a way to track my package, so I could see exactly where it was. I can't say enough about this wonderful camera. I've been shooting with SLRs for 25 years now, and this is the finest one I have ever used. It is such a pleasure to hold and use. You feel like you are holding something very special, as the build quality is top notch.
Summary: After several agonizing months of research and forum crawling, I found myself firmly stuck between the Canon T1i and the Pentax k-x. [...] analysis of the Pentax ultimately sealed the deal for me, promising a compact and responsive starter DSLR with lots of headroom to grow in to (and for hundreds less than the canon).
Summary: If you are looking for a camera that you can use for filmmaking. then buy this one! I was in the same rut as you (if you are looking to make movies), and I did my research and this camera is amazing at taking video and the fact that you can change lenses makes it even better! the quality and wide range of lenses make a perfect buy for its price check out this video I made with the camera! [...
Summary: As much as I would have loved to have a high-end SLR, I just wasn't looking to spend that much money. I'd rather use the extra money for lenses. The K-x had gotten good reviews and was still twice the megapixels of my present camera. I love how light weight it is! When using high ISO (3200 & 6400) the noise is not bad, still there, but not too bad. It cleans up nicely w/ noise reduction software.
Summary: I received this camera last Friday. I had 2 full days to take great shots with this camera. I purchased two bundle kit, which comes with 18-55mm lens as well as 50-200mm lens. I have another manual focus lens, which is A50.7. One of the most asked questions about this camera is AF speed. Yes, AF is pretty quick. To test AF speed, I sometimes turn focus ring to opposite direction and checked the time it takes to set the focus. It was usually less than 0.4s.
Summary: This camera has been easy to use from day one. It takes excellent pictures. I had some trouble using the flash indoors. The pictures were to bright. Then I started using the Tv selection on the dial with a setting of 1/60. I use this with ISO 200 or 400. Indoor flash pictures are now also excellent. The live view focus is slow but I read that most(maybe all) DLSRs with live view have some problems. I just don't use it. I considered myself an average amature photographer.