I can't tell you if the specific product you mentioned was tested, but I think all of the "kitty litter" products fall into the same category -- they all use the same basic compounds. As with most things some people swear by them, others don't want anything to do with them.
I personally don't believe that any of these products are very good for taking decent care of your cigars. It all comes down to this oft-repeated statement: you spend good money on your cigars; is it really worth cutting corners to save a few bucks?
I admit it. I'm biased