This has got me about 5 times since I got the car. It is amazing how hard it can slam on the brakes when there is someone walking nearby when you are manoeuvring slowly - talk about an adrenaline kick! It feels and sounds just like you have hit something. The first two times I actually got out of the car to see. The first time I got out and apologised to a mother who was pushing a pram as I was convinced I had hit her. She looked at me like I was mental!
It clearly works if anything moves around you when you are parking or similar. But do you know if it does the same thing if you get too close to a fixed solid object? I don't want to test it by driving into a wall (even slowly!) but it would be great to know that it would do so if I ever ignored the beeping parking sensors.