After initial setup and experiences, it becomes a great tool for educators!
This tool has extremely powerful capabilities when utilized correctly. OneNote works in a way where each students get their own notebook with different chapters and pages. Teachers set up the "students" notebook with certain pages, and throughout the class year can send them pages with material on them. Student's don't have to download anything or go to any website. What's more is that teachers can access each students notebook, so students can complete the work that shows up in their notebook and teachers can easily go into their notebook to leave feedback. This removes any confusion as to where the homework is and where to submit it.
How I Use It
It's great to use in an Language Arts class, each students have their own notebook and I can send text or assignments straight to their own OneNote that they can markup.