Does the instant zipper work?

The claim is you just snap and zip and your problem is solved. Does the instant Zipper Work?

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SnapZip™ Instant Zipper Fixer - Get 75% Discount – Wowelo

11 ways to fix a broken zipper - best tips and tricks

How to Fix a Separated Zipper: 11 Steps (with Pictures) - wikiHow

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FixnZip (Black Nickel) - Universal Zipper Repair Kit for Jackets, Luggage, Bags - Backpack Zipper Replacement Repair Kit - Instant Zipper Fix (S,M,L) - Made in The USA