Personally only trust the V1. I also had a Passport 8500 and it never gave me the sense of confidence the V1 did. I would prefer 100 false alerts and picking up the 1 police officer if I'm speeding than 10 false alerts and 1 failed pickup where I get a $500 ticket. Also, if you learn how to read the V1 it becomes a very efficient tool that you will not be able to live without.
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2006 e53 X5 4.8is (sold)
2009 e92 M3
2008 E63 AMG
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