Thanks for the info. How does the app compare to something like Electrum in terms of more advanced functionality - having manual control over which UTXOs to spend from, sending to many, freezing coins/addresses, etc? Is is possible to use a passphrase with this wallet?

The device itself looks very sleek, and I like the design, but if I can't use it with Electrum and their app doesn't provide all the functions I regularly use, then it's going to be a no from me.