Slow incoming balls => less pace on your normal/topspin strikes (counter stat)
But in case of being a "counter" style player, your accelerations are less pacy vs slice defence for example...no difference though (vs slice def) if you are a PB with 0% or 100% counter for example...only in normal/topspin shot speed...
100% counter should be superior in all cases (despite of what people used to say about needing to set 0% counter vs Tog; I think that's bollocks seeing that some extra speed on your b1 shots is never a bad thing - well, unless you plan to use weird slow b1 shots and rush the net

)...
Also, high counter improves your spin defence since you can hit faster/deeper topspin shots with a bit more consistency, so it's harder for defender freaks to spin you into submission since you can spin back a bit better...
Anyways, the differences are minor and I don't believe it's a crucial stat to have to be very good, unless you're a counter style player - then it's a MUST to have 100% counter or so
