I use a Varia 715 radar/light/camera. I’ve only looked at the videos once as I’ve had no close calls that needed any further attention. I also use an inexpensive bar end mirror that is a really good device. Between the radar indication on my Garmin head unit and the mirror, I have a very good situational awareness of what’s behind me. As such I see no point or need for a camera that is displaying on my head unit. I want to see my data screen, not a rear image. The mirror shows me what I need to see and the Varia tells me IF I need to look in the mirror.