I have bought a lot of binders for trading cards and such and they always seem to fall apart. The covers fall off the rings no longer meet in the middle etc. But not this binder. No matter how much use you give them the rings always line up perfectly. The covers are reinforced with a rubber strip so that they stay perfect. I have 6 of these binders now and I love them. They are a little more expensive to begin with but since you are not replacing them all the time they end up being a much better value.
It's very easy to open with one push of the finger and because it has a straight side to it the papers all line up straight when the binder is closed. I just bought one and then went back and bought a bunch more. It's perfect to use for holding music during gigs.
I'm a college professor and have used many 3-ring binders over the years. These are the best I have encountered. I selected them because they felt sturdy and durable but only time will confirm this. The fact they were also good looking (distinctive) was a plus. The rings open easily and close securely without gaps. The binders lay flat when fully opened. The rings are D shaped so the content also lays flat. The binders are easy to label and the system used makes it easy to change labels in the future. No more need to apply self adhesive labels on top of each other or remove them several years later leaving a sticky mess. The front cover allow a face sheet to be inserted so you can apply own cover design or insert a table of contents. The cost of the binders is high but I believe they are well worth it if you expect the content to be frequently used (like class notes or research materials) over a period of years.