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I haven't used one, but I think you'll get a lot of false alarms from radar detection, and they mostly use laser now anyway, which by the time you get a warning, it's already too late. On the other hand, a gps based system, especially one with user reported traps, will work 99% of the time. For example, I recently passed a mobile trap, where the guy parked just over a hill. By the time I saw him, he would just measure my speed within a second and I wouldn't have a chance to react, but Waze warned me about him a mile in advance.
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