These are awful. I couldn't even get them to stick to a horizontal surface forget any vertical surfaces. We ended up using tape and magnets to get the notes to stick to the vertical areas we wanted to have them on. Now my students are just using them as note pads. I feel like they were a total waste of money.
They are a staple around our house. Use them for bookmarks reminders on the frig or bathroom mirror notes around the computer . . . the list goes on and on!