I use the W mode for my daily driving. Although still quite brisk, today started out a little more sunny than normal, so I put mine in "S" mode. Today, at 50MPH, I lost all traction, spinning the tires when I gunned it to merge on to I-244. It took three spins/recoveries to regain control. I wonder.... If I had the switch in the "W" position, would the back tires have spun?

Conclusion: For my SRT, during cold weather -even if the roads are dry-, the "W" position may make up for the traction lost during aggressive throttle inputs under the "S" position. (I floored it today at 50MPH and spun the back tires. DOH!)