Customers most agreed on the following attributes:
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I bought the cleaning cloth to test out and see how I like it, plus I figured that as a gray card, it would be handy. I used this with the cleaning solution from Giottos. Be mindful of how much solution you use, this cloth does not sponge up the liquid like the more traditional lens cleaning cloth.
I did a few photoshoots and used it as a gray card to adjust the white balance, and it works better than the gray card I was using.
Great for carefully cleaning snow and mist off my lenses. Only con is that it doesn't come with durable cheap plastic packaging to store it in, but snack size ziplock does the trick.