I have never used a bitcoin ATM, nor have I ever seen one. All I know about it is what I've read from this forum and other sites, since I've never met anyone that have used it. So I would like to ask a few questions that I couldn't get the answer to online.
1. Do they require any form of identification to use? Like a passport or ID card
2. When you want to buy or sell with it, does it have P2P trading? Or does the ATM and bitcoin belong to a company, and you're simply buying from or selling to them?
If I were you, I will go to YouTube and type "Video of someone using bitcoin ATM". This will return many results and you will understand much more details about it.
There's no bitcoin ATM in my country, so I haven't used it and there's no going to be one. This is because bitcoin ATM is no longer the trend. Exchanges p2p have made the need for ATMs less.