I was hoping the Kumho would have better tread in addition to at least the same traction as the Yokos. Wasn't so. I haven't driven them long enough to know how the tread will last, but they definately don't have the same stickiness as the Yokos did.
I was sick of the Yokos though because I had to buy a new set of rears every 3 to 5 months :_(