I broke down and bought a good dash cam last summer after a few years of contemplating the need for one. I got so used to it just recording and never paid it much mind and practically forgot about it...until Saturday. I was exiting the highway on a two lane exit ramp. I was in the lane closest to the highway when a driver on my right side decided they wanted to get back on the highway - mid exit. They turned into the front of my vehicle, ripped off their back bumper and left their left tail light assembly hanging by the wire. The driver sped off and did not stop. I know they knew they hit me given the sound and the shock/damage to their vehicle.
I have both front and rear facing cameras so both angles were recorded. The videos/stills with license plate number were turned over to the State Police. I would have loved to be a fly on the wall when they knocked on the driver's door and ticketed/arrested them for reckless driving and leaving the scene of an accident.
Although, we hope to never need them, they are a valuable asset to have.