I know quite a few ChromeOS users, usually people I know who are not that tech savvy or want a PC for their kids. It's much too limited for most people, and definitely power users. Great OS though, I supported it for 4 years and in education, it's damn near perfect.
I used to use Arch, but grew tired of having to tinker with stuff and most everything I do is on the browser anyways. For the other stuff I have all of my Linux programs still and Android apps and that feels like enough to me. Not limited at all really, but I don’t play any modern games or anything.