If you can swallow the privacy concerns, Chromebooks/Chrometops seem to be remarkably reliable and 'just work.'

My main experience with them is in Google Hangouts through a 3rd party (Promevo), and the only troubleshooting I've had to do required a total system refresh, which the box itself found it's own OS was corrupted, re-installed from a remote source, and then after a quick 10-min setup was right back to where it was the second it broke.

I would probably not use one personally, but for family computing they seem a right treat.