As said above, It's safe.
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They support less coin then Ledger I guess. I had a quick check with keepkey and they listed only a sum of 50 coins if I'm correct.
Yea, I mention those two just as FYI. In fact Ledger or Trezor is the best choice.
I have Ledger nano S. The only thing that i was not expecting is limited capacity.
It means the device can handle max up to 3-4 coins simultaneously. If you want new coin you need to replace (reinstall) one of them.
Funds are safe but this reinstall takes time to synchronize, add accounts ... it's just annoying doing this often.
So if you plan to actively managing, spending more assets better go with the X version.