Oh my gosh, this is literally going to be SO helpful for when I want to take quick notes on what's coming next in the story, or things to go back and fix later. I do notice the stickynotes thing is on the bottom-left side even if emojis are on the right-hand side, at least for me. Not a huge issue, but it doesn't sound like it's intended.
I do also notice it can bug out if I have it on fullscreen and then make the browser small. Not a huge issue, since I can just re-fullscreen and move it. My other very very minor complaint is that it's hard to find a spot where I can drag the note around if the note is small. But I can just make the notes bigger.
Overall, a really helpful little addition and well worth the money! My one real complaint is that I already finished my writing for today, so I won't get to try these out until tomorrow! XD