I used Chrome OS exclusively for almost all of 2013. My last computer gave up the ghost and I didn't have the money to repair or replace it so I was left with my $250 Samsung Chromebook.
It actually worked really well! The Samsung Chromebook was only 11'' and had a 6 hour battery life, which was a lot at the beginning of 2013 before Haswell laptops were in wide circulation. I eventually bought a 24'' 1080p HDMI monitor and a wireless logitech keyboard/mouse set. Chrome OS has very little overhead like I mentioned in my last post so even though the Samsung Chromebook only had a piddly little ARM CPU and 2 GB RAM, it ran very well.
My finances were way better at the end of 2013 because I got a promotion, and a hefty raise, at work so I ended up buying my Mac mini but I still used Chrome OS as my laptop for 2013-2014. Beginning of last year I was in the market for a premium laptop, something with a nice screen, good case, and excellent keyboard. Macbook Pro was the obvious fit as one of the chromebook's deficiencies was lack of support for my mobile devices. If the Pixel 2 had come out a couple months sooner though, I'd probably be using one of those instead.
Chrome OS probably isn't for everyone but I was really happy with it. It's fast, secure, updates are almost instantaneous, and Google doesn't have it locked down so you can do nerdy stuff like run an Ubuntu desktop alongside Chrome OS without much of a performance hit.