I have owned a number of Whistler radar detector units over the years. They have generally performed well and to my satisfaction.I bought this new Whistler XTR-140 about three months ago. I decided to put this through some tests across the western US before I start to rely on it.This unit has very poor detection capability - in most cases it will only go off when the radar is within a few hundred feet, with the radar gun looking straight at this detector unit. Had I been speeding, I would have collected a number of speeding tickets. Within the city limits, the unit almost constantly beeps with false alarms. It provides no reliable laser performance, as with a police laser unit almost within a 10 degrees of the line of sight of my car, this detector showed no activity.Its periscope is annoying and along with the poor detection performance gives you Xmas lighting only.I'd avoid this unit - it is a complete waste of money.