whilst not an evo, i've got a legnum, which has the AYC and a few other bits and pieces from the evo 4-6 range,
i love the AYC system, it has an aggressive feel to it, yet is easy to control, and if you push it too far, it tends to oversteer, so it doesnt feel like you are going to fly off into a ditch in a hurry. (that could be due to my wagon being obviously more rear end heavy though...)