I got this mouse packaged with the Microsoft Sculpt wireless keyboard (which I love). I have been using it for 6 months. Its shortcomings are: *Jerky and erratic movement at times *Buttons get jammed (they 'crunch' when I press them sometimes) *The right button is where I grip the mouse so I often press it by accident when pressing the left mouse button. *The 'back' thumb button is where I grip the mouse so I press it accidentally. *pointless Windows button (you have to move your cursor to the menu anyway, so why not just click the menu button?) *not being able to reassign the extra button functions (or disable them) without installing...view more