As an addendum to this, I'll relate my own experiences. The YubiKey NEO-n (and I'll assume the more recent 4 Nano) are phenomenal if you can (semi-)permanently

As an addendum to this, I'll relate my own experiences. The YubiKey NEO-n (and I'll assume the more recent 4 Nano) are phenomenal if you can (semi-)permanently spare a USB-A port. The ability to generate TOTPs and FIDO tokens without having to dig out your keys is an amazing convenience. Unfortunately I can't say the same for their 4C, which I'm using with the new USB-C-only MacBook Pro. The plastic it's made from begins cracking apart within a month of use, and completely disintegrates within three months, rendering the device inoperable. To their credit, Yubico has replaced my device twice so far, but how this made it past their quality control I have no idea. I deeply hope they fix the plastic durability on this device, as well as offer a nano version with USB-C support that I can leave in my laptop permanently.