In the last episode of the coaching video of Zhao Jianhua and Xiao Jie, they talked about the tension of string that they are using. Zhao Jianhua uses 28lb and Xiao Jie uses 22lb. I remember one thread mentioned about Zhao's reason of using 28lb is the sound of hitting. But I think what was not told was that he said he likes the 'direct' feel of power and control. Xiao seemed not to agreeing with him as she only uses 22lb. I think the take home message is that, regardless of the tension of the string, you can still play good and skillful badminton. I have seen people are getting obsessed with using some ultra high tension (>25lb) regardless of whether it suits their level or style of play. Some may just want to showoff how 'advance' they are by string at 30lb. In fact, any racket that can go beyond (manufacturer recommended) 25lb was rare of around 6-7 years ago, with the newer materials and manufacturing technology, rackets (and strings) can withstand higher string tension whist remaining light. So, think twice before stringing your racket at high tension, it may not do you any good.