The device uses strong encryption (where legal), and goes beyond U2F to include password management, certificate storage, OTP/Google Auth, and plausible deniability. The hardware is teensy-based, and the firmware is open source. The devs have released fairly regular updates, and even encourage hacking on it to meet custom needs.
I love the feature they keep passwords in fact on the device itself, not as a key to enable password manager. I was looking for something like that. If only they offered strong encryption for Europe!
They have an international version that does not ship with encryption of the data stored on the device, to deal with the various laws around encryption in other countries. However, there's no hardware difference, and since it's all open-source, there's nothing stopping you from loading the "US" firmware on the "International" version.
I think for international customers it's better to buy a working product with international support like yubikey rather than a crippled product like this.
The device uses strong encryption (where legal), and goes beyond U2F to include password management, certificate storage, OTP/Google Auth, and plausible deniability. The hardware is teensy-based, and the firmware is open source. The devs have released fairly regular updates, and even encourage hacking on it to meet custom needs.