They're mostly for looks. The additional stopping power doesn't really matter because it only takes a light touch of the pedal to lock up the tires even with the stock rotor. I bought one, but when I got it I discovered that it was one for an 87-88 warrior, so I sold it to the owner of the local atv shop. He put it on his 686 raptor that he runs in mx and harescrambles, and he didn't like it because it ate brake pads like crazy.