I've got one. I use it only for writing. It's been great for that because it's terrible at everything else. It is essentially a modern-day word processor for me. I can work for hours and hours unplugged and if I need to do a bit of research, I can without having to pull out my distraction machine (phone).

It's heavily used at schools these days. Also, a local college has thousands of them here.

Same. Then again, outside of work I seem to rarely see any laptop in use that isn't a Mac these days. I know that's not representative, but still.