Bests & Worsts Reviews from Amazon

This is an excellent device and I strongly recommend it if you use a password manager that supports it (Last Pass, Dashlane, etc). The benefit of this device with a Password Manager is you can enable two factor authentication to add a new device capable of signing into your account. In short, it doesn't matter if someone knows you master password, they can't add a device (computer capable accessing your account) unless the have they have a Yubikey. To add a phone or tablet that doesn't have a USB, use this device on a computer to temporarily disable the two factor Yubikey authentication, add your Device, then reable the key. I recommend getting a backup key or if your spouse or partner uses one, register both keys on each other's account. This will save headaches if the device is lost. This security key has the ability to maintain two two security access methods, e.g., Smart Card and Fido U2F. Be aware this comes with no documentation at all! I mean none - while there is a lot of information on their website and on the Dashlane Password Manager website, you get the feeling that these products are aimed at a narrow group of IT savvy individuals or organizations with IT specialists to configure them for staff. I hope this review is helpful!