The system seems to work pretty well. The cartridges are INCREDIBLY expensive, and the estimates of how frequently you'll have to change them are generous. I've two cats, and the product recommends changing the cartridge every 10-15 days. 15 days is FAR too long to wait, which makes this even more expensive. For my cats, it costs about $45 a month just for litter cartridges. Worth it? Totally depends on you.But, that said, the cartridges are easy to change, though i spilled dirty litter everywhere when i tried to put one in a trash bag. And the cartridge refills did not come with disposal bags like they'd advertised. The cats love it. It's pretty quiet. So far, no jams. Waste does occasionally get stuck to the rake, which sucks. It mostly doesn't smell, but towards the end, the urine smell gets pretty bad.