I just turn my head and look and if I'm still unsure I will adjust my speed for another check.

This projector thing adds another set of sensors and screens that could go wrong and end up being costly to fix in the event you are in am accident.

I know some larger cars or vehicles without windows might have a harder time checking.

It's just an idea done with off the shelf products geez....no need to downplay someone trying something interesting.

If it was full commercial, you would use a short throw projector with distorted projection to match the A pillar.

Having said that I would have blind spot was more a problem from the C pillar.