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This screen protector works well, and even if it does break down, you have three back ups. However, you will not be able to fit your tracker inside its traditional clip charger anymore (yes, a small protector like that makes a difference). Part of this is Fitbit's fault for making an absurd and impractical design for this charger (the Charge 2's clip was far better), and part of this is the retailer's fault for not providing such a crucial detail. If you do decide to purchase this item, you will have to have a weight like a smartphone pressing the tracker down onto the golden pins in order for your tracker to charge, or you can shop for an alternative like a dock-style charger.
TL;DR: Good screen protector. It will affect your use of the charger, so be ready.