I really like how it allows me to easily send my colleagues anonymous or public comments about their work - without needing them to log in! It's super easy (and free) too which makes this tool very attractive compared with other solutions we were considering at one point. Not sure if there are any downsides but so far nothing apparent either :) We're using clinks internally as well as externally via our Slack channel where people can leave notes/comments when they've completed an assignment from another colleague who has gone offline / left unexpectedly etc., just like email does of course!!