I just received my RX65 that I purchased directly from bel it is rev 6.3 and it must be the worst RX65 out there. I located a cop in my town running K band constant on and the detector did not start alerting until I could see him, where as my V1 started alerting way ahead of time and no I did not run them at the same time. There is also a grocery store that has K band doors, which my V1, X-50, and even my 895 picks up over 1000 feet away, but when I drove by with my new RX65 nothing. I had to pull in the parking lot and get right in front of the door before it even made a peep. I am so disappointed in bel right now. I called them up and let them know and they are sending me a shipping label so I can send it in and then they are sending me a new one.