In the GRM tire test a while back, the KDW and the Falken Azenis came out on top, with tires like the Kumho 712 testing favorably, but not at the top. The ES100's were just coming out, and not part of the actual controlled test, but the driving impression they offered is that they compared favorably to the Kumho 712, in terms of quietness etc. for a street tire.
So, think of them as a good street tire alternative to the Kumho, for far less money than the KDW, but not the greatest for autocross.
HTH.
