Usually, with some great gizmo like this there is a video link on the web page. Notice this does not have a video? Wonder why? The camera man probably got squished and the camera wreck.
This is a lot safer then some novice with a chain saw. I see nothing wrong with this product. The video shows it in action quite well. Looks as safe as any other exposed blade cutter. Sickle bar mower for example. Hay mower/conditioner.