I am completely satisfied with the mouse, except for the one described above. The button is located so that it constantly falls under the tip of the thumb. In order not to hurt, you have to bend your finger, which sometimes tires the brush. Other than that, a great mouse that I would recommend Its pros: Very responsive sensor Confident, tactilely pleasant clicks The presence of a large number of programmable buttons Weighty wheel with optics and fast scrolling mode Some cons: Inconvenient location of the button to enable the "sniper" mode on the left side