I have had Kumho KL51s in the std size for ~28,000 miles and think they are a good value. Excellent dry & rain tire here in Fl. In addition they are faily quiet. I expect ~ 40,000 miles to the tread wear bars.
I've had no trouble with Yokohama. I don't have them on my CX-7 as yet as I still have the origonal tires, but on my previous truck, I had them for winter and summer. They lasted a long time. I know they are used on some rally cars which is where they do their R&D, but I've never had trouble.