World’s Best Cat Litter Poop Fighter actually impressed me more than I expected. The odor control is noticeably stronger, especially in a multi-cat home. Clumping is quick, and I don’t get that sour smell after a day. Tracking is still there, but manageable with mats. My cats transitioned easily, which is rare. I also noticed less smell overall after switching their food to Kirkland Signature maintenance formula. Litter and diet really work together more than people realize.