Absolutely love these notebooks. I have the 5x7 and 8x11 sizes and they are infinitely useful. You can send PDFs or jpgs, even gifs by scanning pages in sequence. With 36 pages per notebook, you can keep a fair amount of work before wiping down and reusing the pages. Additionally, the RocketBook website has printable graph, music staff, and lined writing pages in 5x7 and letter size; these obviously aren’t reusable, but are useful nonetheless. As a matter of fact, if you wanted to try the concept before buying one of the notebooks, you could print a few pages and try it out with the app first. I wish that this was around when I was in college; one small, light notebook for all of my classes that I can scan my notes from. The transcription feature also works fairly well, so your writing can be transcribed to type when you publish the page. The only drawback is that you have to use special Pilot Frixion pens, but they are readily available, relatively inexpensive, and come in many colors. (FYI, I use it with email and Google Drive and have had no issues. I can’t vouch for other compatible services: iCloud, OneNote, Slack, Dropbox, Evernote, or Box.)