I am driving the Kumho's and there is a significant increase in traction, especially wet. In Florida wet is very important.

My KDW's traction went south pretty quickly near 10k, just about useless on a wet road. I decided I would rather try the Kumho's and replace them once a year (about 10k) and have good tractiion more consistently then try to squeeze more then 10k out of my KDW's because they cost 50% more.