I'm a long time Linux and Windows user. Occasionally come into contact with a MacOS setup.
I have used FreeBSD in some past IT work. I currently don't use it at the office, but have seen some projects running on it which rekindled my interest in the OS.
I recently installed GhostBSD on two PCs, and it works out of the box in one of them. I am hoping to gain 3d acceleration in the newer PC, so I can run a few 3d games, apps and viewers that have native FreeBSD builds. One of them is a third party Second Life viewer called Megapahit.
In any case, I hope to learn more about the inner workings of FreeBSD. I do enjoy tinkering under the hood with the OSs, so I am just as likely to mess with Windows and Linux when something doesn't function well for me.