Both hardware and software are open-source, free software and allow independent security reviews. Customisable, no vendor lock-in, no security via obfuscation, no hidden security issues!
Received three Nitrokey today (Start, Pro, Storage 8GB). The order was easy and delivered quick (a week). It is nice that it’s all Free Software. Now to experiment with them 
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Any success in the experiments with Nitrokey?
Easy to use, and working well?
It works very well thank you 
I plan to document how to use it as an alternative to YubiKey.