Have blinder m-27 installed with veil on my 2008 black M3. Know several police as I work as physician they have tested my jammers they were shocked couldnt get my speed prolaser usually. I have gone through speed traps here in my town had 3 motorcycle cops all test my speed not one could get a reading. Was pulled over once and questioned why my speed was not measured I played stupid. Last week here in town at very short distance very stealth local cop clocked me with prolaser ticketed. Called Blinder US told me to send in ticket better yet Leon the local distributor meets with me I jam his prolaser in a parking lot up to about 25 feet. Takes me to another area pulls out the "stalker" fires at me and sends my jammers haywire wont stop alarming the whole thing is corrupted. Leon doesnt bring any tools, no laptop tells me he cant fix my system because of the cheetah tells me "they are no good". I get home 1 hour later reprogram my cpu and all works fine again. Then Leon states won't pay for my ticket because cheetah voids the warranty and then states because it wasnt installed professionally that voids any ticket payback. Trashed the cheetah tells me it alters his product. I called Cheetah they tell me everything he stated was fasle and that Leon uses their wireless system and had just bought a few a week before!!! Wont back up his warranty. The jammer works well but it failed me that day. I deserve compensation called Blinder international left it up to the local dealer who isnt going to do anything. But I was promised that when 2.10 comes out it should jam better, less false alerts blah blah cheap talk. I read up the Blinders had many problems programming the m-25. The stalker is a new jammer that smoked and confused my m-27, couldnt handle it and it sent my jammers in a continuous loop. Fixed when I reprogrammed the unit. The jammer worked until the stalker gun was used which most police at local and state level dont have. The jammer failed and Blinder is not standing behind their ticket payback program so beware. Told me he couldnt upgrade my jammer because of Cheetah, told me he hates the cheetah unreliable yet he buys and uses them. The M-27programming simply couldnt handle the Stalker and the gun sent the cpu and jammer heads into a frenzy. My blinder system saved me from several tickets and I have tested it with police friends no Stalker though it always worked. I will be filing complaint with the state.