Post-Its are incredibly expensive. I use these ruled notes for list making and carry them around with me; also for shopping lists for the supermarket and for reminders on my to-do list every day. We have them in every room of the apartment so as to be able to quickly jot down what we need or have to do. They are great! And the price is as I said much better that the brand-name Post-Its and the yellow is less bright which we like better too. My son uses them as well. Only the cat doesn't keep lists!
The size is great for taking notes and having the lines really helps. Only been using for about a week but the sticky on the back holds well to other paper corrugated boxes and maintains adhesive after peeling off a desk top to reapply onto another source.