Apart from more than fast delivery by AMAZON (one day before the scheduled date), I am fully satisfied with this mouse. Including batteries, implementation is easy and frees a USB port, often small, especially on notebook. It also has a nice plastic box that protects the shock in the bag of the computer. Ergonomics are good and you quickly get used to its small size and the choice of two resolutions is a plus. With a more than interesting price, this is a good choice compared to equivalent Microsoft or Logitech.