My two "fun" cars now have Kumho tires on them since I was blowing through costly Pirellis like crazy. The Viggen now has Kumho Ecsta Supra 712 and I think, for the price, they're great. The compound seems much harder than the Pirelli P6000. So far they've been on the car for about 20,000 miles and still look reasonably new. Their handling in the rain is not as good though.

The SVX has Kumho Ecsta 711. They're almost cheaper than dirt and still look new after 30,000 miles. I'm more confident in those, but that's probably due to the SVX being AWD.

After not being washed for a while, I notice the Kumhos start to look a bit brownish. If I apply some Stoner Tire Shine, they're returned to black for a good while. I'm not exactly sure what that's about.