I've had one for 5 years or so and it seems to work
!!
I figured it was just a box with a couple of lights and a noise maker but I have been shot with radar (X,K,Ka) and they didn't stop me but I rarely go more than 7-8 MPH over the limit.
I did get a ticket the first year I had it and the guy got me because I wasn't paying attention and didn't slow down when the radar detector went off....I was listening to Tim Wilson on JB&B show!!! Laughing my butt off even when I talked to the Cop!! He thought I was nuts but he was nice enough to reduced the speed to 76 in a 65 zone!!
Sent it to Rocky Mountain Radar and they paid it ASAP!!
Been paying more attantion lately!!
BTW....I don't use anything in the Cobra......Only in the Crown Vic.
Jack