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I too remembered the old film SLR days...I had a Canon AE1 Program I think it was, with a split prism. I remembered not being able to quickly focus with it...for slow work very precise, but no so much for action shots. I didn't like it very much. I love AF what can I say...
I find a plain matte screen is faster for MF. I switched to one in my FM3A. Plus, the split prism goes dark with everything but fast primes.