I've been using these to sort my 12x12 paper by season, and the rounded corners really do keep the edges from getting dinged up. The snap closures feel secure, so nothing shifts around when I carry one to a crop.
I've been storing my 12x12 paper in a flimsy cardboard folder for years, so these clear cases feel like a huge upgrade. The rounded corners keep my corners from getting bent, and I can actually see what's inside without digging. Stacking them on my shelf saves way more room than I expected.
The snap closures actually stay tight, which I didn't expect at this price. I've got six cases stacked on my shelf now, sorted by season, and the rounded corners keep my paper from getting dented.