Yes, I put a Katzeye on my K5 a couple years ago when I got it. I find it useful enough and much better quality than the Chinese made diagonal screen I bought from jinfinance for my K20.
Yes, because of the greater precision of these screens, adding (or removing) shims is an expected part of the process, as the stock screen operates within a wider range of variability. I ordered the full set in advance and then dialed in the precise one to get the focus perfect.
The folks at Katzeye are always helpful too.
---------- Post added 08-06-2014 at 04:49 PM ----------
Originally posted by blackcloudbrew I had a Katzeye on my K10d and K20d, once I got my K5, the focusing info was so much better I really never found the need to get one for the K5. It may have been the camera or a more experienced me. Never was quite sure but I've just never needed one on my K5.
bcb makes a great point here. The magnified live view and focus peaking are such a treat these days, that one could easily get by without a special screen.