Some defective stock

I've loved every one of the 5 ancestor models I've owned over the years. My first x50 was wonderful. It was stolen along with my car a few months back. The replacement appeared to work for a week, then did a couple 'self sync' cycles, followed by a 'repair required' display. Support gave me an RMA and asked me to do a reset to factory defaults. The detector appeared to work, so I didn't send it back immediately. It seemed to go off infrequently, but was hard to tell if was my imagination. Then one day I approached an officer writing a ticket. The alert started at full power at a range of around 150 yds and the officer was not in the car, so I concluded it was not detecting properly. Support is very responsive and gave me no trouble at all. These detectors are so superior to anything else on the market, I'll stick with this brand.