I have posted a short clip below to show the quality of the picture and how it would look as it is recording going down the road.
The model I have does fairly decent at night also. The one thing to look at in the clip above are the side mirrors that are visible. If you watch the clip you see the car coming up the side of the truck before it passes and comes into view of the camera. Also, it shows current date and time of recording.
Now for the burning question....Why should I get one of these? It's pretty simple really. A dashcam can be your greatest ally if someone tries to say you did something that you didn't do, such as run up on their bumper, lane changes etc. If your in an accident it can help determine what actually happened. Now keep in mind it can be a two-edged sword since it is recording everything as it happens.
In today's society, a person has to 'CYA, or cover your Ass' more each day and the dashcam is just another tool you can use to do that.