Hi
The physics change is tiny and will really only be noticed on bigger faster tracks like the Oesterreichring or the A1 ring, and will only effect the cars lap time on these tracks by a very very small amount.
The feel of the car is the unchanged, if you did not already know about the change you would not notice it.
To use a track like Zandvoort 67 as an example, my best lap time is the same with the updated aero as before, at a 1:30.7.
Compared to the best lap here at ABB of the Capri at a 1:30.5.
My best lap in the Capri is a 1:30.9
And I know for sure that there are drivers here that can beat my BMW2800cs time
