I just had to post to tell everyone how much I love this thing. How can anyone live with a one button mouse? I has three buttones on the left side of the mouse for your thumb. I have these set for one to go forward/next/page down and one to go backward/previous/page up and then the middle one to flip between pages that are open within one application. Makes browsing macrumors and multiple threads fast especially with the scroll wheel on the top. And then you can click the scroll whell, I have that programed for expose to only show the desktop. And then wait, still two more buttons. One of the buttons on the scroll wheel I have programmed to expose all windows and the other to show all the windows in one application. What is that like 6 buttons? No wait, 8 buttons because I forgot left and right click. Wow. And the thing feels great in your hand. The batteries last for days, maybe a week. And the tracking is very accurate and work os just about anything but glass. It really is a sweet little mouse.