It's going to be a mixed discussion. I have experience with them working and not working. I said the h*ll with it and gave up on it. A buddy got a Malibu LTZ and wanted to see what it could do against my SRT 300 (yeah, I know). Cop, blacked out, middle of the interstate, clocked me in triple digits... Radar went off no more than a quarter mile away. Wrote me for 20 over, bless his heart
The technology and radar we use for our detectors is not as advanced at what police have. We have H, K and many different bands but why would "they" sell us something that would keep us from being pulled over? It's a money pit, I liked mine for aesthetic reasons to be honest. Jammers on the other hand? That might be worth while... You'll never catch me using one though.