So I had shoulder surgery last year and for a short spell I used the KI5 before I had surgery, more or less so I could play with minimal discomfort until I got operated on. (2 Bone spurs, removal of cartiladge and cleaned up my Labrum). After surgery I went to the BB11mid, then MP back to my redondo and even tried the 200GMW before settling back to my main stick the TI80. All the frames were excellent in some capacity, but the Redondo and 200Gmw are too low powered for me moving forward, the BB's and the TI 80 inflamed my shoulder with regular use so I was at a point where I was literally going to give up the game. I hit one afternoon with a 4.5 lady friend and she had commented that I had great strokes but it looked like I was working very hard on most of my shots. She suggested that I try an easier frame. She had gone through some sticks this year as well and ended up with the youtech radical and loved it. She was a longtime 200g/300g player prior to the switch. I went home that day and pulled out my KI5 which had been sitting in my closet for a year and a half unused and decided,"if this thing bothers my arm, then I am done, if not I will give it another try, it is after all a "players frame" so it should be sufficient to play good 4.0 ball right? 3 weeks later, I am loving this thing. With overgrip & head tape I have a new and old yellow one, and they both weigh in at 12.4 oz strung at 7 pts HL. This frame is so comfortable, I can't believe I did not stick with it after surgery. It has excellent power, great spin ( I love the 16 x 20 string bed), good touch and my serve has even gotten better since moving to this frame. I have played a few practice matches this week and will begin regular match play this weekend and yup, the Yonex frames are out of my bag. I love those sticks buy i can't take the fatigue and pain in my shoulder any longer. I have had no stiffness or pain at all after I play now. I have one strung with Full VS gut at 60# and one with 17g Klip detonater at 58# and both are equally comfortable. This frame is giving me everything the Redondo MP did, with the addition of extra power for some nice clean winners and more aces, with equally excellent control. The control I get with the KI5 equals the Ti 80. Good plow. Good spin, angles & touch. I never took this frame as a serious racquet, but I sure am now. Going onto 4 weeks of use and I enjoy it more everytime out.