ZERO - I personally will not buy such thing. I got one free and gave it for free too after I play around with it. For me the HW are not useful. I see HW useful ONLY for noobs that are not experienced enough with software and keeping keys secured.

Also the most important aspect that many bitcoiners ignore: use the three levels stash, never keep all your entire stash in one place (wallet/keys). level 1 - HODL (your large amount, your vault, your central bank, in cold wallets/watch only, onchain) level 2 - CACHE (medium amount, your managing funds level, your commercial bank, mostly onchain and nodes) level 3 - SPEND (your daily pockets, spending LN wallets, small amounts enough to cover your spending habits)