Summary: Reliable Mouse, but not thin enough for a laptop bag. This is supposed to be a laptop mouse, intended to be small enough to fit into a flat laptop carry bag. It is smaller in width and length, but it is still as tall as any normal desktop mouse -- close to 2 inches. There are some ultra thin devices made which fit easily with an ultrabook laptop, but this is not one. Works fine otherwise.
Summary: I don't know if I got a lemon or not judging from many positive reviews here. Mine has the cursor moving on the screen when nobody touching it. Electrical noise made the cursor jump when I try to click on something which makes me end up clicking on something else. Not good!