I've let this mouse come 2 times. The first went back, as the left mouse button in contrast to the right at the waitresses always was a loud metallic click of my fingers and knuckles while had the feeling that she was lightly beaten with a hammer. I was most this inequality betw. Left and right key disturbed. I let me therefore another mouse come in the car hoping that both buttons would behave as pleasant as the right of the first mouse. Unfortunately a mistake. Now give a both mouse buttons feel to play a round with a click-clack. Shame really as the overall design of the mouse is actually quite appealing.