The worst part is they claim to be open source and pointed me over to their github which doesn't actually have any information or details on the source of entropy as it is (apparently) based entirely on another organization's hardware. Extremely concerning, considering other wallets both (A) fully opensourced their entropy sources and (B) allow you to choose your own keys:
Discussion
Don't get me wrong though - outside of this issue, the Bitkey would likely be my most used hardware wallet.
I haven't put any measurable bitcoin onto any of them, waiting to see why everything else about it is so perfect but this one thing ☹️