I haven't used it yet, but they seem dangerous in the sense that it can really do some cutting! It's big too, seems very durable, and slides smoothly when opening and closing. I'm saving this for emergencies, such as if I were in flooded area and couldn't get my seatbelt off, I'm pretty sure this will help cut through the seatbelt. Unfortunately, this has happened in my family with a morbid result.