I picked up a used 3.872 and put it through the paces from Cali to Washington and back. Nice save on the I-5 last night, rollin 69 in a 55 got a 1.7 mile alert from LEO. He was shooting 1/2 second burst every 30 seconds or so. Found him hidden just beyond the overpass on the right using the overpass to hide behind. 1.7 miles may not be a monster save but since his signal was blocked by the overpass and his sight of the target vehicle was 500ft est. I consider it awesome. I also had a monster save in Dunsmuir , Ca rolling north on the I-5. 3 tenths of a mile from the crest of a monster down hill I got the warning, and .7 miles from first alert I met the Leo half way down the hill shooting North bound traffic in the face. The size of the hill made it a great alert, plenty of time to slow down. I have had 2 3.864 and this 3.872 appears to be better on 34.7 and for sure the arrows work great with no Ghosting. So far I am very pleased with the 3.872's performance.