This topic has already been raised, and someone believed that it 'should be closed' as it had been 'answered a number of times' (with personal, high-level 'belief' rather than technical fact).
Thus, I couldn't add a comment to it, and have re-raised it.

I am considering buying a second-user hardware wallet, and was in the process of researching the risks involved of pre-users 'hacking' such a device, when I came across the above post and wanted to add what seems to be a pretty definitive / thorough investigation into this (from a purely technical / expert point-of-view rather than simple 'gut-feel').

The link to this is here: https://blog.gridplus.io/hardware-wallet-vulnerabilities-f20688361b88

This guy isn't 'guaranteeing' anything (I wouldn't post it if he had, because we should all know that there is no such thing as '100% secure').

ATB,

Red