I disagree.
The numbers make it sound lame, like its higher treadware, etc...but i'll tell ya man, these 300 tw blow away my 140 tw re050a's the car came with. I used the ps2's on the M and they were outstanding, and the super sports are even better.
The limit is so defined, and they let you know, verbally when you're getting close. But it's pretty far out there.
the kdw's are like 6 years old now design. They come stock on the 458 and many other super cars.
Like divorce, they are expensive because they are worth it.