bmattock
Veteran
There is another, far cheaper, option for getting better focusing ability: the magnifying eyepiece. I put one on my K10D after seeing the Katz-Eye prices. The new eyepiece helps.
http://www.bhphotovideo.com/c/product/469574-REG/Pentax_30150_O_ME53_Magnifying_Eyecup.html
I'd try this first based on the risk/reward factor.
That's pretty cool, thanks for sharing the link! I may have try that one myself. However, that's about what I paid for my cheap Chinese split-screen viewfinder, and it works, as I've said, great. Wonder if I could use both this magnifier and the split-screen together? Hmmm.