I recived mine (from the same gyu as Ira) last friday. took a while to install because I had to do it 3 times (somehow it got dusty during this process so I had to take it out). I made a little scratch but it's at the top edge so doesn't bother me. manual focus is much easier than with original screen. and this metal spacer was very annoying, but I managed. if there's nice weather saturday (wishfull thinking) I'll go to zoo to check it out with my vivitar 70-210.
Mine is not coming out again.
Daniel, this screen has a much smaller split screen and a very nice micro-prism collar. See the diagram below. (Please note that the diagram is for illustration purposes only and is not drawn to scale)