Hi Greg (and Larry too!). I'll add my two cents worth here since I own the ist ds, k10d, k20d and now the k-x. My k-x meters better than any of my other Pentax cameras. The high iso images are absolutely amazing! It is a little fiddly without two control wheels (I really like having two control wheels). BUT I find the controls on the k-x and the menu layout to be excellent and easy to manuver. I can set most everything I need to without ever taking my eye from the viewfinder and that is within 2 weeks of using the k-x. I am very happy with the k-x.
I will admit that I am having a bit of a struggle with macro shots with the k-x. I haven't quite nailed down what is going on, but I just don't seem to get as sharp an image with macros as I do in other situations with the k-x. Funny that using the k-x with the bigma I get the best bird in flight shots I've ever taken, and with much more ease too. My k-x focuses very fast and makes tracking birds in flight a real joy. I am looking forward to using it this season at my son's baseball games.
Like Larry, the k-x came down to a price I just couldn't pass up so I went for it. I am happy I did. I am really enjoying the camera.
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LaRee
http://www.flickr.com/photos/27204583@N05/
http://www.laree.smugmug.com/
http://laree.zenfolio.com/
WSSA #181 Pentax Chapter