Pros: Good form factor and size.

Cons: Scroll wheel is terrible.

Overall Review: I bought this mouse to replace my logitech m305, for which I lost the receiver. Unfortunately, I cannot get used to the supposed benefit of micro-precise scrolling. The wheel offers me almost no resistance when scrolling, making me feel as though my finger is resting on a marble sitting on a sheet of ice. My muscles get tired just trying to keep my finger in one place. Middle-clicking on links becomes difficult, because my finger might move slightly as I'm pressing down, and all of a sudden I have scrolled above or below the link I wanted to middle-click. At the end of a day of using this mouse, I feel extremely irritated, as though I have been forced to walk around all day with a pebble in my shoe. Using this mouse will make you appreciate the value of having fewer notches in your scroll wheel.