No camera, but I used my phone once with a handlebar mount and positioned it to record. I've done it once. I've thought about doing at different times of the year or in the dark but haven't. And actually the one time I did it I was playing with the time-lapse like feature of my phone's camera, so basically it is my commute sped up which makes it look like I'm biking in a Formula 1 race.
I don't feel I have time to mess with a bunch of footage. If I were to get one, I'd go the delete it except when something worth saving happened route.