It's great. Doesn't have the directional indicators but doesn't matter. One time on the highway it detected a cop over 3 miles away.
You can tell a lot of times if its a cop or not by the way the bar strength is. 1-2-3 bars but constant then usually the cops behind you. 3-4+ bar all of a sudden is usually him somewhere farther up front.
6 bars and ur still speeding you deserve a ticket.