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I love Amazon reviews because they are by and large, honest reviews by real consumers. I bought them based on previous reviews, and I have to say they are true! Upon delivery, I put them in the sun for a couple of hours to reset them.
My primary use for them was for my motorcross boots - they get used for hours at a time, in sweat, mud, grime, dank water pools, etc. and they stink as you would imagine. Try as I may to clean them, and leave them in the sun, the smell just won't leave the insides of the boots.
I put 1 bag in each boot, and like magic... no more foul smell within a day. Absolutely amazing. I now have them in every wardrobe, drawer, shoe rack, my car, my wife's car, etc.