the mouse do not work well on most surface . unlike the usual laser mouse the mouse do not use the same laser mouse of the very resent past have . Logitech call it a `` performance laser '' its anything but when use anything but a perfect surface . I get a wireless mouse and keyboard so I can toss it around the living room and use my big screen as my monitor . . with this mouse I get frustrate with it not do as it should and what older mouse would do . to be more precise ... the now familiar red laser be not visible anymore . . and the hole for the tracker be not in the middle like standard mouse . . so you have to keep the right edge as close to the material you use to slide the mouse over ... if this be the future of the mouse ... I want the little ball in the middle back ... I can deal with clean out all the junk the ol ball and bar system accumulate but this new laser thing be a constant problem . . I also find myself hit the insert key when go for the backspace key ... Annoying ... I know you can fix that I think but Logitech do not make it a easy thing to do ... also the software take a very long time to load make I think Logitech be get a little to invasive when install . .