I had to return my first two PRO-78s as one had a defective display and the other would not retain my preferred settings.
My third PRO-78 appears to be a charm. It's very quiet, but the range appears to be up their with the tested leaders. Yesterday, I picked up a K band speed sign 1.6 miles away. I also picked up a KA band signal from a state trooper traveling in the opposite direction on the interstate at 1.2 miles away.
Overall, I am very satisfied and I wouldn't hesitate to recommend it to anyone.