Obviously the effectiveness is there but technically is this a good shot? http://www.youtube.com/watch?feature=player_detailpage&v=lCPo2Fe7zQs#t=83 He bunts the ball very flat, pushing the racquet forward through the impact point. No topspin, very unlike the textbook 2 handed backhand. He has to have insane timing on nearly every ball and does not get any topspin to add margin for error/control on his shots. Im surprised how consistent he is with this technique you would think he would hit so many balls long considering he control the ball with spin.