I have the quaife atb on my car.
400+BHP engine, 235mm tires.
I took the car to the ring last year and the amount of grip out of corners is ridiculous. The car just wouldn't powerslide....
So much better than standard.

I use the car on the road aswell (private roads ofcourse) and even when cutting a corner / muddy inside of corner, i never experienced any 'loss of drive'.
Maybe when one wheel is totally airborne, but in real life i never had problems with it.