Hmmm...this rubber is interesting. First, the ultima sponge being in the tensioned category is very sensitive to blade hardness, and the given rating is applicable only when glued to a hard blade (speed is much lower on softer blades). Second, as a long time user of Mark V,this one plays very differently by comparison; lower throw angle and more of a driving rubber than a looping rubber. Ball needs to be hit more head-on than a grazing style as most of the speed required to put the ball over the net is coming from the sponge. Also the rubber has a somewhat nonlinear response - at low impacts it is quite slow, but shines at higher speeds. Spin is on the high side and the rubber is lightweight. All in all, it takes getting used to, but not exactly a rubber with all the gears. Maybe more suitable for backhand.