Adam Savage likes them so much he has at least one maybe two videos on his channel dedicated to them.
The fact they're disposable mechanical pencils annoys me, but they are decent writers with a good eraser. You can buy them in packs of 20 for a few bucks.
Proton docs works on android as a web view. The drive app launches the web editor in a web view control. It works well enough, but it's not standard notes.