Different pros: - Battery needs to be changed very rarely. - symmetrical, and this eliminates some of its shortcomings (I will describe below). - compact - nothing more (even a USB whistle is not needed) Got cons: A year later, the main key began to register extra clicks at the moment of release, but personally, I simply rearranged the mouse under the left hand, and the problem was solved. Not sure if this solution will work for everyone๐ .