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I used 4U with Exbolt 63. I originally liked head-heavy rackets and used the Astrox 100zz. I was stringing it with high tension and it caused a lot of dents, so I bought the 90 Ryu, which is rumored to have similar specs. The difference with the 100zz is that the head is obviously heavier on the 100zz. I feel that the shaft is sharper on the 90 Ryu. In terms of drive and handling, the 90 Ryu is more effective. For smashes, it is easier to angle the 90 Ryu, but in terms of weight and speed, I think the 100zz is better. The 90 Ryu is easy to handle, and the shaft is stiffer, so the high back flies well. Although it has head-heavy specs, it is a racket that is easier to handle than the 100zz. If you string it lightly, you will feel the head-heavy feeling, but when you hit the shuttlecock, it will take some time to get used to it because the swing is so good that it creates an incredible bounce. It is a feeling that you don't get with Yonex rackets.