It depends on the size of your cats. It is expensive if you have big cats like mine but it is almost carefree and there is no dust and very low tracking- you will only see some pellets from time to time. To me it is worth the extra money because my cats now hate litter that sticks to their paws. This is the only system they will use.
It depends on how many cats and litter boxes you have, along with what kind of litter you are currently using. I have 2 cats and one box, and I ended up being a little cheaper than the expensive clay litter I was buying.