Its too small. Its too heavy, It feels like im wearing a gauntlet. There are only 4 extra buttons. all the rest of the buttons on it are the stupid speed buttons. so that's probably only two extra buttons from your older mouse. if you have a mouse mat that has a built in cushion like mine it will feel weird because your supposed to hold it at a low angle. the speed buttons are crowded into the area the left mouse button resides in. so if your playing a twitch game like a RTS or FPS you might have to relearn your touch and muscle memory.