I can chime in that I am under ALL situations faster using the DFP over the DS2 (except for maybe the silly Coffee Break license tests with the maze and the super-tight gymkhana course). It's not only the steering input that is more precise, but the throttle and brake application as well as the enhanced ability to left foot brake in a more controlled manner (with the gas floored). This DEFINITELY helped this last week at la Sarthe.
When first getting started on the wheel there is a tendency to dive too hard into a corner and feel like you need to really crank the steering around more than 180 degrees, however with time and training it becomes pretty clear under most circumstances that you can get away with less if you brake correctly prior to the corner. Also, lock to lock quickness may feel compromised, but again, style adjustment is necessary.
My $0.02.
-SHig