It's squinty. Very. Night and day to the M finders (I have the M2). Flare? Who knows? Maybe, too squinty to tell. I wear glasses and its enough that I can see the patch to focus and get a general idea of composition. But I love the feel and the handling of my IIIA so I put up with it. I believe later ones might have better finders. But if the finder is that important to you it might be best to stick with the M and its extra weight.