as good as any camera is, if its just a scratch your not going to be able to prove they did it, just prove that they were near there on the day that it occoured... any damage the camera could pic up i.e. them falling into the car and putting a big dent it could be picked up on a webcam. so just set a webcam up in your window to record out the window onto your computer and save your self the money of buying a full cctv type system my opinion