I've used it to tone down the language I wanted to use in an angry email. I wrote the draft that I wanted to send, and then copied it in and said "What's a more diplomatic way to write this?" It gave a very milquetoast revision, so I said "Keep it diplomatic, but a little bit more assertive," and it gave me another, better draft. Then I rewrote the parts that were obviously in robot voice so they were more plausibly like something I would write, and I felt pretty good about that response.

The technology has its uses, but good God, if you don't actually know what you're talking about when you use it, it's going to feed you dogshit and tell you it's caviar, and you aren't going to know the difference.