One of those ebay sellers, JinFinance claims that the Pentax cut screens are better than the Minolta cut screens. I think he says it's because of the thickness of the screen.
I bought one from him and installed it. No instructions were included but I looked around on the net and found something. The screen included a shim but the info on his website is says you don't need it.
Which is where I have a problem. It seems to do great at shorter focusing distances, but not so good at further distances. Not sure what to think of it and I haven't had much time for any extensive testing, so some feedback would be appreciated.