When is Sure-Grip actually necessary?

I need a sure grip in my /6 A body, I am sure your time and cost to put the sure grip in will
be the move you need to make... wait till you turn on to a wet or sandy dirty road and need to get out of the way of on coming trafic :banghead: you will be wishing you had a sure grip, or if you line up next to me at the track :D and that V8 can't get out of the hole and get beat by a /6 :burnout: