The delivery took only 14 days (!). Overall the mouse is much bigger than regular one, especially the small extreme photographed on the pic, but in length it's the same as horisontal logitech. I have really small hands so the mouse could be a bit smaller to fit perfectly but it is not inconvenient. All buttons work well (right and left click, one scroll out the press option, forward and backward buttons), there is no DPI regulation.
good for the price