Summary: Had one of these for many years. Finally wore it out. Bought another and love it just as much! Good contour - fits hand well. Easy to depress the button(s). Would highly recommend for a good, standard mouse.
Summary: Right out of the box my Microsoft optical mouse never worked right - without warning the cursor would inexpiicably jump to different corners of the screen. Either that or it would jitter, making selecting a target a hit or miss proposition. I bought this Logitech, and everything works correctly - no jumping to corners, no jittering cursor. My Microsift mouse now resides in the electronics recycling bin at the county landfill.