For the sake of her "they've hacked me" paranoia, my crazy sister made me install OpenBSD on her crappy PC three-four years ago (Intel i3 and a mechanical disk). She stopped using the PC altogether like 6 months after that. It wasn't really bad, everything seemed to work, taking in account the limitations of the hardware. The upgrade procedure irked me, though - mostly, realizing that you have to be reading documentation constantly even for a freaking minor version upgrade.
Still this made me try FreeBSD on my PC, only to realize after a couple days that pkg/pkgsrc are utter shit compared to Portage. Alas Gentoo/BSD is long gone, otherwise I'd love to try it.