When looking for a mouse the main things to look out for is shape, sensor and weight. The shape is simple, solid and I can grip it easily on the sides with my thumb and two last fingers. The mouse is rather small, I have 19cm long hands and my fingers go 1cm over the edge but it is still comfortable. The sensor is the PMW3366 at 1000hz which is very accurate and responsive. This mouse is lightweight at only 85 or so grams so I never get tired or sore using it for 6+ hours.