Last spring I modified my Pontiac Bonneville for second gear start for winter driving. The problem then was that, by the time it was finished, the last winter weather had ended in my area. So I had to wait for the real trials.
Now I am very glad I did do this. The Polar Vortex sent winter storm after winter storm into my area. This device has changed my car from being skittish at every snowstorm to a car that is very useful in this weather. It works as well on this car as it did on my older cars.
The biggest trouble is that sometimes I forget to turn off the factory supplied traction control switch. It turns itself back on each time I start the car.
I had trouble only two times. Both times I was going uphill in ice, and the car suddenly stopped and would not go. Both times, I had forgotten to turn off the traction control after restarting the engine after a stop. The traction control had locked the brakes. Turning off the traction control restored control.