I use them for school work at the university. it's easy to keep up with all my notes from different courses. The perforated pages make it easy to remove them and store elsewhere or discard as needed. I like the large spacing.
I am using these notebooks for my clubs and committees and they help to keep me organized. It also helps that I don't have scraps of papers or notes floating around which usually get lost and then I forget to take care of what I was assigned. If someone gives me a note the note book is great to attach the note to a page for easy reference.