I have used these for years and love how they last. They don't have sharp corners and are flexible. However the newer ones have a pocket with a button in the front taking up space. Regular size papers don't fit with the flap closed! These used to have a flat pocket in front and in back that were much quicker and easier to use. I take a razor and remove the flap so I can get to the pages I need.
I love these binders!!! They look and feel like a quality product. I love the D-ring the pouch inside the window on the front cover (for a picture) and the window on the outside spine of the binder (to indicate the contents of what’s inside). I highly recommend this product.