...
I would avoid the Maxwell screens
with center microprism spots --
in my experience they are not up to
the other screens' quality....
I would like to politely disagree here. At least, this has not been my experience. I have two Maxwell screens, one with split image microprism and one without, on two different Rolleis. I find them both excellent in use and indistinguishable in quality.
On the other hand, I use split image microprisms regularly in my 35mm cameras, so perhaps I am predisposed to like them and rely on them. And, to be fair, when I talked to Bill Maxwell about which screen to get, he initially recommended the plain screen.
But if you are used to the split image, and it helps you, as it does me, I firmly believe that there's no reason to avoid it.
-Laura