I replaced my Bridgestone Turanza Serenity tires with the Continental ExtremeContact DWS. I am very impressed with how quiet the ride is (I can faintly hear the engine at highway speed now), and the ride is smoother than the Bridgestones too. What impressed me most about the tires is the snow traction. This is not a car made to perform in the snow. My wife and small child got home from the airport in a snowstorm recently with no trouble and I was very happy to have chosen these tires, which were better in the snow than the Bridgestones ever were. I have a steep lip on my driveway, and it is difficult without 4WD in the snow - I was very surprised that the Continentals had no problem getting the car into the driveway that night.
The only negative I can say is that maybe they seem to drift a little bit more than the previous set I had on at highway speeds, but well worth it for the above improvements. I have only had them a couple months, so cannot speak to the durability yet, but at this price and performance vs. the Michelins I was considering, I would be ok to replace at 40k instead of 50k.