I'll add my testimony. I just got mine today. I ordered it before this thread came up. It took a few weeks to arrive (which they warn of on their site). I had been deliberating between this one and the diagonal split prism from jinfinance. Somewhere--I think on one of the jinfinance ads--I read that theirs is cut from a k1000 screen, others from a Minolta. As a Minolta convert, I can say that the latter is probably true. Side by side, they sure look the same.
I bought this primarily for primes, and as it looks to me, I feel fine at 5.6 or wider, so it will even work with just about any cheap 4-5.6-ish zoom, if that's a concern (assuming you're focusing wide open, which is the only way I know how to focus, since the aperture only closes for the instant that the shutter fires, or when you engage DOF, of course). By 5.6, if my eye is far enough off center, half the circle will black out, but I can easily have it not black out. By about 4, the collared prism doesn't
quite disappear, and the mat may be a bit dimmer than the original around 4 as well, since the mat is more pronounced (which I think is good for manual focusing).
As far as accuracy, mine is bang on. As far as satisfaction, I am
extremely satisfied. I look through there, and I feel like I've come home again. For anyone who's shot much back in the day, its behavior is just what you'll expect.
The only difference from a film camera, I suppose, is the slight metering inaccuracy with my 50 1.4 M lens (my only M lens--so far
). My initial impression was that the new split screen metered better than the K10D's original screen, however. In fact, I chose this screen (same as the OP's) over the jinfinance in part because I heard it had a more matted (darker) surface, and that was what gave the LL-60 screen its metering advantage with M lenses. So, I took it upon myself to run a pseudo-scientific test. I took shots at all apertures with the split screen, pressing the green button between each f-stop shot. Then I swapped back to the original screen, shot the same shots and posted the results, so that you can see for yourselves (maybe dismissing the f1.4 split-screen shot, as it looks like a slight anomaly, and I may have done something wrong with that one shot). These photos are only meant to test the metering. They were shot through an old, slightly wavy-glass window, so lack of sharpness is not a product of missing focus with the new screen:
Split screen:
MobileMe Gallery
Original screen:
MobileMe Gallery
This is about as scientific as I get. The new split screen definitely appears slightly more consistent to me, though.
I also found a good Youtube video tutorial for changing the screen--credit to codiac2600. It's a very quick process.
video:
YouTube - K10D Changing your focusing screen.
I hope this helps. This site has helped me a lot in my transition to Pentax.