When I looked into mirror systems a few years ago the video display was only a small part of the mirror, maybe half. But now all adverts seem to show the whole mirror utilised. But is it significant that the images shown always seem to be photoshopped side views of exotic cars etc, not realistic rear views? Have the systems really improved this much or is it just the new norm for advertising moral standards ? I would want to know more about the real field of view that is displayed. It may be there in the small print.
If the car has a built in infotainment screen that is compatible with an aftermarket reversing camera I think I would prefer that option .
I have one as standard on my Mk4 EX. They are very useful and worth the trouble of fitting.