When I use traditional ATM I know more or less what to expect. I know that I can withdraw my money from my bank account and it is pretty straightforward process.

On the other hand with Bitcoin ATM it is a lottery and you are never sure, I keep asking myself:

What can I do with machine like this? Can I buy BTC from it for FIAT, or can I load it with my BTC and then withdraw FIAT?
What kind of fees I have to pay? Do I need some kind of ID to use it?

All these thoughts have successfully discouraged me from using a Bitcoin ATM.