Highly recommended for individuals and businesses. I purchased Yubico YubiKey's to start my security key journey for the personal security of my online accounts. I thought they may become an irritant having to ensure I have a key with me. In the end, they complement my iPhone, which is a security key itself. In most cases, I mostly use them with work/public computers/networks, and seldom need them at home. If purchasing, I recommend the YubiKey 5 (except those in the blue colour). The little bit extra spent on the YubiKey 5 in the black colour option includes one-time passcode capabilities (same as those used via an Authenticator app). Once you have codes setup, they're available via any device with Yubico Authenticator, on ANY device. If you haven't got your phone or it's dead, YubiKey is a great backup, with codes available via a friend's device!