I love my CatGenie but most importantly my cats love it too! They love that their litter box is ALWAYS clean and I love that the solution in the cartridges sanitizes and its veterinarian tested and approved! My male cat loves CatGenie so much he guards it from my female cat, so I bought a second CatGenie for her. I bought the SaniSolution 6-pack for both CatgCenies and I rated its price 5 starts since one cartridge lasts me almost 2 months. That is less money that I was spending on cat litter bags! Great product, great price!!