I have the KDW's on my Cougar, and I do drive them very hard, and got
about 13k out of them. Two main reasons, I autocrossed on them(8 times), and my access road to work is like sand paper(well it was they just repaved it) and I drive hard on it.
I will probably get another set of KDW's although next season I'll have a dedicated set of tires for autoxing so I won't be beating my road tires to hell.