This big boy has a ton of hair and at 16 years old, he’s not the best self groomer. We’ve tried several cat brushes including the Furminator, and regularly use pet shears to shave some of his hair down, yet nothing really cuts through the mats. I end up having to trim him with scissors, which is a dangerous job (I’ve accidentally cut him). This tool makes it super easy and safe to remove mats as well as the thick undercoat where mats begin. I recently bathed and brushed this cat, and then went back over him with this brush. In 15 minutes, we had a cat-sized pile of hair. He purred the entire time. This brush was very gentle yet effective. I’d highly recommend it for any owners of long haired cats.