We use these binders at work and won't use anything else. They hold up to opening and closing multiple times a day but never develop the "gap" where papers come unhooked. They stand up well on a shelf.
I bought this for my daughter who was entering middle school and it works perfectly. The d-rings are surprisingly efficient and my daughter says that it has lots of space and that the side pockets are very easy to access. This binder can accommodate 8 tabs several folders and pencil pouches and still have a lot of space. I would definitely buy several more of these in all different sizes. We are definitely going to get another one next year and possibly many more years to follow. The rubber spine is amazing and it doesn't break even if you throw it on the ground super hard.