..and that goes to any racket models(ie. Yonex, SOTX, Hi-Qua)...And is it true the Oval rackets provide larger "sweetspot/hitting area" than isometric or square ones??..
iso racket has a larger sweetspot than oval rackets. however, fans of oval rackets will tell you that if do you hit the sweetspot on a oval racket, there is a higher repulsion, almost like an explosive response: http://www.badmintoncentral.com/forums/showthread.php?t=8337