I'm ready to replace the focusing screen in my Rolleiflex SLX and am going to buy a Maxwell. However, a search of the forums seems to suggest that the matte-only screen is a bit brighter and doesn't have dark edges when compared to the microprism/split-image screen. I must confess that I view the the MP/SI as a bit of a crutch for my aging eyes, but if the matte-only is truly easier to focus with (since most points are not in the center of the frame anyway) I'll go with it.

I'm also planning to go with crop lines instead of grid or none.