I used it for work as a dash cam, got a few hours of footage, but my goal was to record the road.
The good thing was that I could plug it into the car. A 16 GB memory card would last over an hour at 720p. Only issue was turning the thing on and off, but the newer more expensive models have wifi built into them now. Wide field of view was great. Never used it at night. Only issue was when the sun was low and it got into the shot, that made everything dark but still visible. Because the FOV is so wide, framing wasn't an issue despite having no LCD.
Having to manually wipe footage may be annoying. That and remembering to turn the thing on.