My kitty hates change so my expectations were low but she didn't hesitate the first time I put it in her litter box. I've always been a change litter weekly person and haven't been able to change as yet. Am using 1/2 Catalyst and 1/2 lite clumping litter at the moment. My girl is so tidy, I want her to have a super clean place to do her business. The odor of the unscented Catalyst is an earthy one and not unpleasant. Only notice odor first couple days after I change litter.