Many good things about this mouse, but it is simply too heavy to work comfortably with. 141g is almost double of normal USB mouse, and 50% heavier of normal wireless mouse. Portability is poor for the weight and bulky size, and such big mouse has NO COMPARTMENT for its USB adapter, Boooo. This mouse is ergonomic to hold even with big hand, although not ergonomic to move. All the buttons including wheel and side buttons are quiet (far from silent). Side wheel is a bit tight to scroll compared to middle wheel. Thumb rest button is too far off, the thumb needs to move quite a distance to effectively press the button. Totally not for fast & far moving i.e. gaming, 3-4 monitors, drawing etc. Make it around 100g and this will be a very good ++ wireless mouse.