Does anyone use the Scoop Free Self Cleaning Litter Box for their cats?

I just purchased a Scoop Free Self Cleaning Litter Box (a href="http://www.amazon.com/gp/product/B000ELUQQS/002-7158175-9600832)." rel="nofollow"http://www.amazon.com/gp/product/B000ELU…/a I'm looking for ways to make the refill cartridges last and what's the best refill litter I can buy to minimize odor. Please share your tips with me!!