I have the m80 in my car and haven't run into a problem with it yet. Fortunately no one has tried to steal my car so I can't comment on the effectiveness in real life situations but I'm sure it will do the job
I had Daniel from PPI install mine and was very happy with his service and I think it cost me all up $680 which included alarm, tilt sensors, the ultrasonic sensors and auto window closing control unit.