I've only seen it in passing, not looked at the hardware or software or tried to verify any of their claims. But here are my quick thoughts:

- Good design to not have any wireless hardware

- Open source hardware allows people to verify that fact

- CPU is actually the same make as is used in the Signet, but theirs looks much more complex model (based on the picture)

- Form factor is pretty cool, but if customs asks you to turn on your "phone" to prove it works, things might get awkward

The first thing I'd want to know is what secrets are stored on the device, if any. Since it has a secure element, I'm guessing the secret is on the device. The next question is about the ability to make a backup, and how is the secret protected?

I prefer simplicity in design to banking on a secure element that I can't fully audit.

I've poked around in the codebase for SeedSigner and I can say that it's legit. It doesn't store your secrets at all. You enter it each time you boot. Requires you securely store your seed phrase, but that's not a problem for me. 😎