Had to return the standard ring binder I bought on the teacher's list for kindergarten because granddaughter could not open rings. Had to cough up a lot more to get the easy-open heavy duty ring binder that opens with ease. To me it is grossly overpriced nothing special about it except better hardware.
I can stuff them pretty full and it doesn't spring the rings. It's sometimes hard to turn the pages when it is super full but I know I have it overfilled.