If you have a Maine Coon or impatient cat. Dont bother
I'll begin by saying it gets a 5* because it does what it says it can do... removes alot of fur.
BUT.....If you have a Maine Coon, semi/long haired or young cat like I do I would'nt bother wasting your money. This products head is so small and so the surface area you a combing is so minimal you will spend half a day getting through a long/thick haired cat... Do young cats really have the patience to let you brush them for 2-3 hours?!! In the case of my Maine Coon, the answer is NO. He barely lets me get the brush/comb into his furr for 2 minutes let alone enough time to groom him sufficiently! He doesnt like the way it looks and he eventually starts to attack it, and personally I dont blame him. Its very heavy and the metal head is quite sharp, so if hes moving around alot you need to be careful you dont wack him in the face! I've tried introducing it to him slowly and always stopping when hes had enough thinking he would eventually realise its not all bad, but after weeks of doing this still no luck.. and in the meantime of wasting all these weeks trying to introduce a BRUSH he's still coughing up hairballs and his coat is overgrowing.
I would say even with a short haired cat there are bigger/more efficient brushes. Unless you have a cat who is prepared to be brushed by this tiny headed comb for awhile!