Our wagon has an electrical draw that no shop has been able to diagnose thus far. Sometimes, it can go a few days or a week without any issues, and then all of a sudden, you park it for 5 minutes and doesn't have enough power to start. It's left us stranded a couple times, and sometimes even our Noco battery pack isn't enough to get it started again. I've been disconnecting the battery when we park as a stopgap until we can figure out where the electrical fault is, but it's annoying doing that every time we park. This makes it much easier and more convenient.
Also, some of the 1-star review note that if they click the "off" button accidentally while the car's on, they lose all power and risk an accident. That should only be happening if your alternator is shot; once the car is running, you can disconnect the battery and it will stay on (you won't be able to start it again until you reconnect it, though). I tested it in the video and it keeps running all the same.