I was hesitant to make the purchase after reading 90 percent of the reviews that claimed the mouse slipped out of their hands while using it, but I can honestly say that I have never used anything quite like this. I am pleased with the purchase because, when used in conjunction with a mat of superior quality, the sensor opens to a full one hundred percent and I did not notice even the slightest disturbances in its operation. Different advantages include a high-end sensor, a convenient location for the side buttons, a comfortable shape for the mouse, software that is simple to configure, a large number of customizable settings, a nice and high-quality material, an easy to clean surface, a relatively light weight, and an easy way to remove dirt. Some cons: After three months of consistent use, the wheel developed an unpleasant creaking sound. Even with headphones on, it is difficult to make out what is being said; however, it is intolerable without them. It doesn't take much use before it becomes really dirty.