This mouse, like all Logitech here until I used / possessed, turns both comfortable, responsive and easy to install (the Unifying nano-receiver is a genius invention that allows to control keyboard and mouse without hitch). This is a particularly reasonable price, given the quality of the product. there a few years ago, such a level of technology, precision and comfort would have justified a much higher price. Only hardcore gamers will find hysterical to complain (knowing they have anyway horror wireless equipment). I recommend this mouse a heartbeat ...