I live in Florida, where the roads are pretty good.
At 38,000 miles, my back tires are nearly done, near the wear marks. Front tires still have the DW mark. Overall, I'm very happy with the treadlife; I've done suspension mods recently, driven the car hard and treadlife is still good.
For a summer performance tire, DWs are a nice balance of price, ride quality, traction, tread life, and wet performance.
When pushed hard, my car has plenty of grip and everything is predictable. Car feels very composed in the rain and we get plenty of rain here in Tampa.
I'm looking to buy replacement tires now and DWs are on my short list. Only reason I might pass on them would be to splurge on something finer like Michelin PSS.
***UPDATE - just bought them again today. They're just a great value with many good qualities. Mich PSS may have better responsiveness and traction but the DW's have longer UTOG, lighter weight and cost 25%+ less.