I've used a GoPro knock-off (SJCAM SJ4000) for a year and a half now, and it can be a hassle but usually isn't. Fortunately nothing too bad has happened that I've needed to turn over video to the police or anything, but I've caught a lot of interesting things. Bad driving, pretty sunrises, unexpected events. The SJ4000 and most action cameras is set to just loop recording, so I never bother looking at footage unless I know something has happened I want to look at.