I know this will get buried, but I had a layover at an airport that had one of these. I thought....eh, sure, why not. It was loud, and embarrassing in a super busy concourse, but super memorable at drilling in the cadence and strength needed to do chest compressions. It's an experience you might easily chalk up to a waste of time, or something only an outgoing person might do to burn a few minutes.

Except a few years later one of my best friends heart stopped right in front of me. I immediately rolled him over, started compressions, and restarted his heart in about 75 seconds. It was like clockwork, just like I remembered on the machine "ahhh, ahh, ah, ah, staying alive, staying alive". I kept repeating it in my head to keep the beat. Staying alive, staying alive. And he did stay alive. His heart restarted on it's own, he went to the hospital, and had zero long term side effects.

So if you guys see one of these things, go ahead and use it. It might save your best friends life.