When I did all the research some years back I settled on the Beltronics RX65 and it has been reliable and a great investment.
That said both radar gun and detection technology keeps advancing, new radar guns are digital, use wideband Ka and have super quick response, so your detector needs to be able to monitor a wide range of wavelengths and provide an even quicker response. The Escort Redline is one of the best rated detectors currently for open road. If you are driving around town and red light cameras are a concern then the Bel Pro 500 offers some advantages.
Julian
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