“Germid”rear view interior mirror with rear view camera

Hi, any one ever used one of these Germid rear view mirrors with a reversing camera window within it, it is supposed to replace the original, and with some wiring give you a reversing camera totally independent of your MMI, it looks convincing but would like to know more before buying, cost is £128, the mirror replacement looks identical to the original on the advert and is made specifically for Audi and is not the clip on once.To retrofit the MMI unit to have a reversing camera included is £700 or over, (unless you know better) hope someone can help 👍🏼