Pro's and Cons, the jury's out on this one....
I wasn't a fan, found the crystals really sharp and surprised my cat tolerated walking on them. Didn't get anywhere near the 25 days use suggested for one cat, nearer the 2 weeks mark and despite stirring after every use ended up with a soggy pile of crystals at the bottom (yes, I did put the recommended amount in the litter box) Also made my laminate floor really dull where they tracked on the floor and painful if you tread n them in bare feet. On the plus side easy clean up and nice fragrance.