I have 4 cats and live in a 3rd floor walk up. As I get older, lugging up fresh litter and lugging down used litter can be challenging. Using catalyst makes this so much easier! Even the used litter is so much lighter than the clay I was using. On the down side, this does track all over the place. If you don't have carpet, it's not so bad, but there is more cleanup than with the larger clay litter granules. I did not notice an odor difference. I did notice that when scooping or adding litter there were no dust clouds which is great. For me, the trade off of having to sweep more often vs. ease of transportation, ease of scooping, and using something that is more earth friendly is well with it. If you have multiple cats or older cats, you will appreciate the quickness of the absorption rate- no wet paws from stepping in a puddle on their way out of the box. It's also soft so I know it feels better than clay on their paws.