I've been using Chromebook as only computer for the last year as a student/developer(/tech-entusiast) and I am very satisfied.
I have the Samsung ARM one, and I've installed chroagh[1] (super easy, run one command and you have an arch install) headless, so I have a complete linux terminal. SSH would also work.
Right now I'm looking to upgrade (to macbook air 11" I hope) for more power with the same 8h battery time.
As a mobile and disposable (cheap!) terminal (and browser!), I can definitely recommend a chromebook.
[1] https://github.com/drinkcat/chroagh