Old post, but in case someone researching this now exists. In heavy rain on motorway the side cameras are ridiculously awesome. 100% clear visibility that no car there rather than making best guess looking at a blurry scatter of light through a rain covered window at rain covered side mirrors.
Also felt it was a little weird to get this just when turning left or right, but already saved one cyclist who thought he'd cut on the curb side.
I just need to create driving habit to look to screen when changing lanes instead of side mirrors.