Yeah, I use the power assist all the time at the finish line... It will not engage if you don't slam on the brakes. Its does not interfere with performance driving/racing if you know your car.
The only time I use it, is when I'm barreling through the finish and need to stop on a dime. Just slam on the brakes and your blood will flow straight to your face!!! It's awesome!!!! No tire screeching or anything.
At first when I was learning my MS3 on the track, I did engage it in the corners a few times, I was used to my non-ABS Miata brakes, anyway, there is a slight delay for the power assist to deactivate. If it happens on course, just forget about your lap...it kills time your times.
But like I said, if you are familiar with driving/racing your MS3, you know how far you can push the pedal before it activates...you really have to push on them hard to activate it.
