I have a Samsung ARM (2 core, 2G RAM, 16G Flash) based ChromeBook, Model XE303C12. It's rather simple to get Linux to work on it. You first enable developer mode and then install Crouton (which basically runs a full fledged Linux in chroot jail - to satisfy the based Linux install.
It works exceptionally well and I generally get about 10 hours of use on each battery charge. I store my work in progress on a USB3 USB flash drive.
The screen is only 1366 x 768 and the touchpad is rather lousy. So given the shortcomings, I've gone back to using an old MBP. Maybe buying a second-hand MBA and installing Linux on that is the better option.