Going back to 101 level stuff, I got an acute matte screen today. It's so much brighter than the screens that came on my (now gone) 500c and the split image (pre-acute matte) in the 500c/m. Easier to focus too, but I still need glasses to do it. I'm going to get a chimney with a diopter adjustment and go without the glasses - I only have a -0.5 diopter prescription for distance, and generally prefer not to wear them.
I have two of the latest chimney finders with the diopters and they are great, one is with me at the moment for use with the Flexbody. I also stocked up on diopters for my waist level finders and PM finder back when they were plentiful and cheap. The PME-90 I use with the CFV II 50C back has one built in, a darn nice finder.