They are not that expensive compared to O/E, only a few quid in it and they seem far more intelligent.
Personally I fancy a rear view camera, we have them on the trucks, you can almost see around corners with them being 9 metres behind the driver.
Home to black Alfa Romeo 159 3.2 V6 Q4 ,green MGF VVC and red MG Maestro T16.
MG - the friendly marque.