I love these binders. You have to be careful with the cover plastic as it can tear when inserting a new binder cover inside. I've never had the binder corners rip and I use them everyday during the school year. They hold up very well throughout the year and although I haven't put 600 sheets of paper in them they do hold a lot of paper (and get heavy). I wish the stores carried Red in stock so I wouldn't have to order it online only.
Attractive binder that is missing a couple of features - it is not gap free so the paper does tend to get stuck in the rings and it is missing the hard rubber or plastic sheet that makes it easier to move all the paper at once to close the binder