The Valentine One is the undisputed winnner in the "least detectable by a RDD" category. For those unfortunate people who live in a state or country where radar detectors are illegal or who happen to be truck drivers, the Valentine One is for you. There have been a number of RDD's but Spectre is the most commonly used RDD in the world. All of the tests below were done by SML and the 2005 results are at the top of the list.