The mouse fits comfortably in your hand and it is pleasant to work with her. The only drawback is the battery life, this is around 1600 dpi in sleep mode just 68 hours (with both the supplied and purchased additional batteries). Why the mouse only a battery and can not absorb about two, she will not reveal to me. Even the battery is charged not fast, which means to me that the mouse is operated basically only wired. That I can serve them wirelessly, was very important to me, so there are two star deduction.