I bought this brush for my boyfriends cat about 2 months ago. The cat is a black domestic longhair, and his previous owner hadn't cared for his fur. My boyfriend bought him a cheap brush, and when he hated it profusely, my boyfriend just gave up. He had a large buildup of matts all over him, the worst of them on his lower back and hind legs. Working for about 5-10 minutes at a time, every 3 or 4 days, we gave him a good brushing all over. He tolerated it in the areas that weren't too bad, but since his matts were so bad that they pulled his skin, we had to hold his scruff for the tougher areas to keep him still. 2 months later and his body is 100% matt free, the only ones left are on his tail (his previous owners apparently had children that carried him around by his tail, so he's extremely sensitive to people holding/ brushing his tail, so we delayed the worst of it to the end of the de-matting process). After each session and his treats, he takes a moment to straighten his fur again and is then a visibly more happy cat. This brush not only helped to shave out the matts on his skin and desheds the excess fur to prevent the buildup of more matts, but its gentle enough that his skin is not at risk of being cut or scratched too roughtly. This brush is incredible and made our cat more comfortable in his own skin. 100% recommend for long haired cats with knots or matts, even with sensitive skin.