I didn't try any command line utilities and only use it for the web with Firefox (e.g. GitHub). Can confirm: Works well on both Linux (needs some udev rule, but I think that's true for all these sticks?) and Windows.

To further answer GP: Lacks Bluetooth/NFC, so it's not usable with a smartphone (okay, maybe with a large USB-OTG adapter). No idea on the supported protocols, I think Yubikeys offer a lot more options there, but it's good enough for web authentication.

Manufacturer support was pretty good: My first token was DOA, and I got a replacement token plus a free Mini. The replacement is now my backup unit and, as mentioned, carry the Mini on my keychain.

Could you say which ones? It would be good to know whether anything I use is known to be problematic with these.