Good keys
I am satisfied with ldlc because the price was a little cheaper than a famous site. I was delivered super quickly in a relay (the next day) with standard delivery.
The keys allow you to save MFA on online accounts for double authentication. I wanted several so that I could have back-ups in different places as well as one near me.
It works well, but you have to realise that these are FIDO2 keys. Some sites show support for yubikey but not fido2. So you'd have to get the more expensive keys and not these ones, which only support fido2.
I took usb A and not usb C because it's still widely used.