If you go to many of the websites that test detectors usually the Escort Passport series and the Valentine V1 are ranked the top two. The V1 is great and has a cool feature of telling you the direction you are being hit from. The Passport's have very similar performance to the v1 except the directional alert option. However the 9500 series of Passports, like what Boramkiv said, has the ability to mark false alerts via GPS tracking. I've used many different detectors and I've had the most success with the Passport series. Lidar though is a whole different detection method that is hard to detect and react to. Laser shifting is really the only way to counter lidar but it is illegal in many states to interfere with police lidar.
2009 AW 535i
-Sport, Premium Package, and Comfort Access
-FBO, custom Cobb E45 map, Feul_it Stg2 LPFP, Performance Gearing LSD.