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The ability to lock an unlockable door without leaving marks or drilling holes? What's not to like about it?
It's very easy too use, I didn't even read the instructions just got straight into it. Comes with a little black carry bag/sack so it doesn't snag your keys when in your pocket.
It's important to note that this works on the inside of doors which open inward. It's not for locking others in. It's conceivable that some non-standard doors might not work for this. Sliding, concertina (folding), and garage doors aren't supported obviously.
Still, I'm impressed with both the novelty and practicality of it.