I think it’s great for a home router and firewall. I wouldn’t recommend it for commercial use if you maintain a lot of firewalls for customers which is a mistake I made with it. They kept making breaking changes to the pf.conf syntax, so entire books, countless write ups etc on pf would become obsolete. This is in accordance with their BDFL’s philosophy that breaking changes are a good thing because then you’re “in a better place”.

What is really, really nice about OpenBSD is running ‘ps -ax’ on a fresh install. You get about 10 processes, each of which has an obvious responsibility. You can actually understand everything your OS is doing. Try that on Ubuntu, Windows, macOS.