Today I have my FIDO U2F Security Key received. He is quick to set up and can be used without any problems. The breaking out of the map is somewhat reminiscent of a one-time items, or a SIM card. For durability, I can naturally not say anything, but I do not expect that it will last forever. Perhaps there will in the future a little higher quality Key (even with NFC / Bluetooth for mobile devices) to the market. So far I am satisfied anyway.
To the frequently asked question: Yes, if you have the key to Google enabled, you can easily still have recourse to the SMS code or the Authenticator app (one must also, as the drive is + used only with Chrome v38) ,
