I'm using FIDO U2F Security Key with my Google account on my Ubuntu machine 14:10. It took me some time to get it working - there were problems not only with Ubuntu configuration (udev and user's privileges), so but with Google Chrome U2F implementation. I must admit I did alsohave U2F Security Key from other company (very costly, but with the same usability as FIDO U2F) and problems with it were the same, as with FIDO.
It looks volatile (more than in reality), but for this price I can not ask for more;)