I think there is confusion that lidar means stationary lazer. That's not really the case. For example my ticket on the outskirts of town. It was a cop car going the opposite way and he hit me when he drove by. I had No alerts, no notice... If he was using regular radar I would have been notified well in advance on a high way.
The radar detectors definitely work best on the high ways. I've been half a km away when it would start to go off giving me lots of time to slow down. There are tons of times its gone off and given me plenty of notice... Even driving down the freeway late at night as the police are roaming for speeders while speeding them self.
With all of the lidar I see a radar detector as a diminish value especially if you aren't regularly speeding.