Mine has it and its working great. One of the best technological features that I've seen for quite a long time.
Basically, there is an option under the configuration parameters, which allows you to set the distance/sensitivity of the radar. When I set it to low, it feels like the system is not working at all. I think it works best when its set to high.
The only issue that I've found, is that the warning beep does not first lower the radio volume, so sometimes it goes unnoticed!!! other features (like the blind spot assist) always lower the radio volume.
The way to test it, is to get close to a car that is slowing down, while you are speeding. The system should immediately display "!BRAKE!" on the mini-LCD screen and make lots of beeps. Eventually it engages the brakes on its own, unless you steer away from the slow car.