I suppose they are 'squinty' compared with an M viewfinder. But in their day the LTM was a revelation, which suggests it is what you are used to that makes them squinty. Give yourself time and it wouldn't seem to bad. I can see the full 50mm frame wearing my glasses, and it is easy to focus in the other window of my IIIF. What I don't like, and where the modern era has spoiled me, is the time it takes to load film. Not a problem at home or a relaxed day out, but annoying if you are missing things happening in front of you.

Steve