This is my go-to litter pan for my 3 kitties. The large size is excellent. None of my cats are geriatric so they don't have trouble climbing into it. I wouldn't recommend it for a cat that has mobility issues. But I just love this product especially for the excellent price. I actually have trouble finding good quality open-air litter boxes anymore at pet supply stores. They all sell covered boxes which I personally believe cats don't prefer since they can feel trapped, and they don't need "privacy" like humans do!