I use this binder and flip through pages hourly every day. They must lay flat and turn easily with reliable ring closure. The seams are durable and have not cracked.
I teach community education classes that meet in a variety of locations. I use one of these binders for each class and I am able to keep a wide variety of material organized and ready to go. The labeling allows clear titles so I don't grab the wrong binder by mistake.
The clear plastic cover sleeve and inside front/back paper retainers (also clear plastic) are loose fitting do not hold documents securely. The cover sleeve is especially thin and I am sure it will tear easily in the corners under continuous use.