I don't like Tangem wallet and I would never recommend it to anyone.
First of all Tangem code is closed source, and they had serious security incident in the past when private keys got leaked from their Tangem app.
Another reason I don't like Tangem is that you can only use it with their app, so there is no way to use any third party wallets.
In case Tangem company goes bankrupt there is good chance coins will be lost.

There are good alternative devices in similar card format liek Satochip and Keycard, that are both open source.
They provide much better alternative for backup with encrypted cards like Seedkeeper.