Go here http://www.radardetector.net/forums/
and you can learn more than you will ever want to know. These people have hobbyist among them that have purchased various radar/laser equipment and done substantial testing as to what works and what doesn't. This is the most active detector forum on the internet and like any such forum it has many fanboys but outside of sorting those types out there is no more comprehensive repository of such knowledge on the internet.
2012 E92 Space Grey with fox red/black/black, comp, premium, DCT, premium sound, sirius, heated seats.