I believe it will be more efficient if hoops were rounded on both sides and straight in the middle because you have to lift all at once the papers inside or they catch
love the colour durability and how the ring close evenly. very rare ive found a binder that the rings have closed evenly without any issues. The push button that is used to open the rings is also very practical and helps a lot.
I like the look and "feel" of this ring binder but it won't serve for a full load. When my 3" binder was 3/4 full the center ring did not stay closed and flipping pages was difficult as each caught on the metal prongs. I returned this for a brightly colored Avery binder also on sale and am pleased with it.