Originally Posted by ersin
The best detectors are currently the Valentine 1, Escort 9500ci, Escort Redline and Bel STi-R+. The V1 and Redline are "windshield mount" and the 9500ci and STi-R+ are "remote" mount. All are stealth (undetectable by a radar detector detector) except the V1; important if you drive in VA or DC. They are the most sensitive detectors available. You've spent plenty on your BMW. Don't skimp and get a cheap detector because the cheaper ones do not perform as well. There is lots more to say about this topic so do some Internet research.
Also, don't forget about a laser jammer if it is allowed in states where you drive. And in the end, it is not the detector that will save you from a ticket but the way you drive and your attention while driving. Detectors are just a supplement.
+1, couldn't agree more. No detector will catch every 5-0 out there, especially ones who have all systems off and are just cruising around.
As for choosing one over the other, the 9500ix is plenty sensitive and catches Ka fine. Can't tell you how many times I've heard it go off and I'm like "where???" and then 30 secs. later....AH there's 5-0, I see you...