I met them some time ago during btc atlantis. I love the project too, it's open source if I'm not mistaken. For me one of the coolest things of this project is the NFC interface they created where the device is powered by the energy provided by the nfc and you can interact with the hw through the phone and see some feedback in the screen. If I remember correctly, they also have a touch button in the device to do some confirmations etc.
Discussion
That sounds like what I got from the website. There's a pressure pad at the very end of the device that you have to hold down during the NFC process. It's supposed to be an extra safeguard to make sure you really want to sign the transaction. Nunchuk Wallet added support for it in their latest update, which is interesting because they otherwise only support COLDCARD and Tapsigner. They must have been sufficiently impressed with the Portal to add it to their wallet. And I haven't looked, but I bet Sparrow supports it as well.
Decent piece of kit. Like a tapsigner with a display. Flakey support for Keeper - exporting XPUP doesn't work. Works OK with Nunchuk. Warning: current firmware doesn't support reset so do not set it up with testnet. Instead you can use JTAG to reset. For the same reason make sure to write down the seed words correctly. Unavailable in UK - for some reason they do not send it there. 🤷♂️