I strung my newly SOTX D600 at 28 LBS.And amazingly I feel the recoil is very less and more power explode foward.A sturdy bang !! (excellent material) Another racket (Impact Wood Power 800 Pro) with same string and tension I feel a great recoil and vibration on my wrist,and shuttle goes slow. So I've just newly recover that the material also determine the string tension. I'am not regret buying SOTX-D600 over Dans (DinkAlot's) review. SOTX technology really rock. YONEX!!, whats ur NEXT.??? R&D..zzzzzzzzz.??