This controller certainly helps for clear button mapping for the MK X, although after a few weeks the color of the square button has completely faded and although I'm not sure at times it feels like that the X button is not always registered. At first I was concerned that the left side of the controller is longer than the right side, but that seems completely natural. It's also worth noting that the Share and Option buttons are very close together, making it difficult to hit the wrong one or both.