I have ASCBS and I do not doubt that it works, but it is disappointing that there is no audible warning until the "BRAKE!" sign appears, which is only a fraction of a second before the car will brake. Before that, the only warning is visual (I have the "Heads up" windshield display). This is not very helpful as it requires you to be looking straight ahead, in which case you could just as easily see that you are about to hit another car! The point should be to warn you when you are NOT paying attention to the road in time to apply the brakes in a normal manner. Even with my system on the "far" setting the warning is too late.