Performance-wise, this unit is great. I am a law-abiding citizen and a car-traveling salesman. My attention to speed is often overcome by other attentions. The RMR 450 has saved me from many potential speeding tickets. I have had several RMR detectors, and the common failure in this Texas heat is the sound component of their units, but RMR is very good with their warranty. I would recommend it for anyone with a heavier than average pedal-foot.