I have bough serveral of these mice. The are good mice with accurate movement and everything one could ask for . .. except once extremely important problem: if the ball pops out of the socket, the slightest impact against another object produces a small scratch or dent in the ball. I ask you . . . even though a mouse is supposed to stay on a desk how many times does it fall to the floor buy accident. Well, with this mouse one time is enough to render it almost unusable.

This small scratch or dent in the ball catches against the three plastic guides in the socket producing a small hitch to the movement to an incredibly annoying freeze of the ball moving anywhere.

Small as this may sound, even one dent in the ball will catch dozens of times and hour if you move the ball a lot as in during game play or heavy editing of a text.

Despite the advantages I love in this type of mouse I will never buy it again.
I have bough serveral of these mice. The are good mice with accurate movement and everything one could ask for. .. except once extremely important problem: if the ball pops out of the socket, the slightest impact against another object produces a small scratch or dent in the ball. I ask you. . . even though a mouse is supposed to stay on a desk how many times does it fall to the floor buy accident. Well, with this mouse one time is enough to render it almost unusable. This small scratch or dent in the ball catches against the three plastic guides in the socket producing a small hitch to the movement to an incredibly annoying freeze of the ball moving anywhere. Small as this may sound, even one dent in the ball will catch dozens of times and hour if you move the ball a lot as in during game play or heavy editing of a text. Despite the advantages I love in this type of mouse I will never buy it again.