I can't use PyPy until it implements a real Python 3 version, i.e. one that supports asyncio, which is the real future. Until then, I will just be reading about PyPy on Hacker News and just sighing...

Edit: For everything I use, I try to find an asyncio version - Slack client [0], SSH [1], etc.

[0]: https://github.com/gfreezy/slacker-asyncio/

[1]: https://github.com/ronf/asyncssh