I routinely buy this binder. The covers are stiff not flimsy. I appreciate the clear envelope on the front inside cover to hold receipts/notes/clips etc. The ring design allows for flat pages with no curving at the rings when it gets towards full and pages don't slide when closing the front cover. The sleeve on the outside front allows for unigue covers and the same for the binding sleeve to identify the notebook on my book shelf. The color choices can work great for separating topics/subjects/clients.
I’ve used a variety of binders over the years from teaching or organizing recipes. These stand the test of time. The one tab to release the d-rings is genius. I have purchased 20 or more in the past 8 years and every “old” one looks as good as the new.