Consider buying one as well and testing it out. Listened to some podcasts/shows with nostr:npub1az9xj85cmxv8e9j9y80lvqp97crsqdu2fpu3srwthd99qfu9qsgstam8y8 and he seems like a total cool dude who thinks a lot about safety and the users (in contrast to Ledger for example).

2 secure elements is a pro. Total air-gap is a pro. I don't think you get it any safer than this. But nevertheless no first-hand experience (yet) here.