Love the durable non-spiral binding.
I work as a special education consultant and my calendar takes a beating. It is in and out of my portable file box multiple times a day as I move between school buildings, or in my computer backpack as I move within a school building. Spiral bindings get smashed, and some non-spiral bindings just fall apart. I'm impressed with the stability of this calendar. I'm old school - I run a paper calendar and Google calendar so I can crosscheck myself. Finding one that isn't held together with Scotch tape within a month is a blessing!!