I bought a Chromebook because it was cheap. Asus C720.
After one hour with Chrome OS I was ready to scream and throw objects so I removed it and installed Linux in its place. It took me a long time to get it to work properly. Something would constantly pop up and be a problem. So I'd fix it and a day later I'd bump into another problem. Finally I got everything to work and look PERFECT and then I dropped the Chromebook from a table to the floor.
Luckily I had it repaired without any costs to me but... they re-set it to original Chrome OS state. So I had to install Linux again. I couldn't remember how I fixed some things. Then keyboard would start to lag, I'd be typing "keyboard" and it would somehow become "kyebroad". So I installed a different flavour of Linux which came with a different set of problems. I couldn't right-click with the trackpad. "It works here" was the main info I got off other bewildered C720 owners. But finally, after weeks of work, I got it to be 100% perfect. Then I left it too long without charging, it discharged completely and lost the ability to boot into Linux. Which I could only regain by reinstalling Chrome OS only to type three commands in the Terminal and reinstall Linux again.
At some point I realised I have a cheap, light computer with speedy SSD which I use 70% of the time to fix errors on the aforementioned cheap, light computer. So I resolved to buy a Macbook when I have money. Thanks to MF and a visit in Apple Store I settled on an Air and every day I praise the Gods for giving me a laptop where PgUp and PgDn and Polish diacritical characters and sound and YouTube JUST WORK without me having to spend hours fixing one of them so that another can break.
TL;DR: Buy a Chromebook for your worst enemy.