I ride with the Cycliq Fly6 on my rear, which is 720p and a red light combination. Fairly decent camera, but since my state does not have front license plates, it's not been all that useful for that. It does do a decent job of recording audio, frequently capturing my less than polite replies to the yobos offering their interpretation of traffic law. It ran me around $120 on a seasonal sale. The Fly12 is too pricey for me, at $350 but sure looks nice.

I also run a GoPro knockoff from Aldi (Bresser brand) on the front. For $40 I cannot complain. It records in 1080p, loops in multiple time segments, came with a waterproof housing, and all sorts of mounting options. Capturing license plates is hit or miss during daylight hours, but at night forget it. Sound recording is turned off, since the microphone is encased in the housing. The battery lasts for 2 hours max per charge. I usually charge it at work and home after my commute legs.

I don't expect the cameras are going to protect me from bad drivers, but hope they may give evidence for myself or my family.