It was also lacking, when trying to overpower very spinny shots from my opponents. Lack of mass was perceptible................
i have the regualr length version on order and have and have owned a x-yellow and x-white.
i keep the tension at 50 or so with multifilament string. i had some trouble with deep toppy shots but the racket is so quick i got to where i could do a semi-potent high forehand slice response to drive the ball back low and skiddy and/or a squash like slap on teh FH side with good placement...for my level anyway. this tended to make the 2HF toppy hitter to have to bend a bit more for the next shot buying me time.
with soft strings/tension i find that the lighter X frames can give good power response as well.