I feel the same way. Prettier is a dream--instant speed, great output and 100% reliability for over a year.

So far black seems great. I just ran it on some existing Python packages and it was fast and the output was correct. Still need to try the editor plugins but very excited so far.

Now, if only someone would lead a similar project for R. :)

That's been my experience. I'm using the VSCode plugin and have for the first time ever enabled format-on-save for Python. I have yet to have any reason to see that as anything other than a positive.