The thing with tacky rubbers on both sides will not matter for a beginner due to skills not yet developed but the moment he or she becomes an intermediate level player, the player will realize he has to put more effort on rallies in the backhand.
With the type of rubbers nowadays that are very fast, you do not need to go beyond the speed of ALC blades. Hell, i am only using Yasaka W7 and Xiom Extreme S with Omega 7 Ying but already have a fast setup.