I replaced my nine-year-old ThinkPad a few months ago (it's slowly running the latest Ubuntu). I went round and round for about a year and finally decided to get a used Chromebook Pixel. It's awesome! I thought I'd play around with crouton for a while, but eventually wipe the whole thing and install Linux on it.
I haven't done that. I do run crouton and can flip between ChromeOS and Ubuntu 14 in a keystroke. The thing is, ChromeOS is a really nice broswing experience and 75% of what I do is browser based. I could spend all day in Ubuntu, but it's just too nice using ChromeOS.
I'm really happy with my Chromebook.