if you're car is setup too stiff you'll just slide around and won't be fast despite the lack of body roll. setup too soft and you will be slow recovering from excessive yaw. the trick is to find the sweet spot in between too stiff and too soft where a little mechanical grip along with many other variables (alignment, tire size/pressure, aero, etc.) can add traction and speed. also if you add grip to one end you'll lose grip on the other end. so depending on your driving style you can fine tune and get the car to do exactly what you want. most expert drivers prefer a suspension that is tuned to be a little tail happy. our cars suspension is tuned from the factory to understeer for obvious safety reasons considering the high hp and the propensity to oversteer and potentially wrap the car around a tree. finding that perfect balance is what all race teams strive for
"I would quote everything pixelblue said, but you've already read it. Take it from someone who's put the 1 through its paces"