Just took a trip to and from Port Huron, and they must be having a speeding crackdown on 94 or something, because I had 3 cop encounters with MSP and port huron police. They were using instant-on Ka. In each case, I got a Ka alert at 1 or 2, growing to 3, then the detector goes silent. 20 or 30 seconds later, I see an oncoming cop car (detector not alerting). It was a nasty mix of construction so I was already traveling right on the speed limit, so they weren't "saves" technically, but nonetheless I was impressed with the detection performance.