The manual sent with these cameras/system do NOT match. You have to sync the cameras individually, but the way the manual is written, it doesn't distinguish that fact so if you simply try to follow the instructions, it won't work.
I had to repeatedly email back and forth with someone who repeatedly provided unclear instructions. By at least their 4th email, they realized their instructions were highly flawed and they started providing better detail on how to get it to work.
I had to repeatedly send videos to the manufacturer to show how the setup wasn't working, which ended in weeks of emails back and forth.
I haven't travelled on the road with these yet, unfortunately the unit wasn't setup by the time I travelled, due to erroneous and highly flawed instructions where they're going to send you a manual for a single camera system instead of a multi-camera system.
The battery life seems to last longer than expected. I couldn't get back to my rig for a week until I could follow more of their specific setup instructions, and the cameras were still live with battery life and I didn't have to charge them again so that was a pleasant surprise.
I imagine if these dont' fall off while I drive, they'll be good. I wish you could turn of the cameras from the display instead of on the individual cameras, but I imagine if they work and that strong battery holds to the vehicle, it should be a good system. The picture is very clear, but I haven't tested in rain, wind, dark, etc. - yet.