I got the 8500 X50 Rev. 6.3 about a month ago. So far I am very happy with it. Very few falses with it was the first thing I noticed compared to the Pro 78 Rev. C that I had. I got a half mile more advanced notice on K band coming up a slight hill in a spot LEO likes to sit than the Pro 78 gave. Have it hard wired above rearview mirror using City LowX mode with scanning dot.