Title: Bought two, one broke
Product review: I bought two of these to use at my stand-up desk. The overall idea is fine, I prefer them to standing flat-footed. However, there is an air valve that can be used to add air, and the valve separated from the body of one unit and is now bouncing around inside. I don't see any good way to repair this, and the Harbinger website customer service page is not helpful.
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