Working 12 hours a day and I've also been a second for the notebook gained with this mouse. The ergonomics are very friendly hand and the silent scroll is a great thing, especially if you sit on the train and thus the sleeping Passengers not bothered. The pressure points are very clear, however, require a little more force when pressing than in other Logitech mice. The clicking sound is also a bit noisy. But you get used to it very quickly. The battery will last despite the long missions several months. (Approx 4Monate) The rubber sides are very good in the hand and allow a precise and fast work on. Have this mouse now more than a year in operation and had to complain no wear and tear, or falling Gleitpads on the bottom. Due to the flat design, the wrist is no longer as strong bent and is even after hours of work still comfortably in the hand. , Meanwhile, this mouse will cost no more 50. Absolute buy recommendation