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I have one of these and I'm very unimpressed. The warnings are far too late, seemingly only to alert me when in visible range (not much use). Surely there is enough radar spray for a decent detector to pick up the signal before visuals. I've even tested this by 1) approaching those trailered roadside speed readers, and 2) by walking walking around a police cruiser left in a parking outside a coffee back with the radar left on.
Pretty useless for sure....