This is a clever tool. It's not ideal for all performance situations.

If you're neck and head are visible during the escape you won't be able to use this without exposing it.

I have tried using this tool on many of my own handcuffs and it just doesn't fit. Smith and Wesson nope. Doesn't work with chains or hinges. Vipertek hinges? Nope. Doesn't fit.

The tool I received fit in a set of Vipertek chained handcuffs and nothing else in my collection. I was hoping this would work in a challenge scenario, but the tool just doesn't fit in many standard cuffs, and I haven't got it to work with any hinged cuffs like it is advertised.