Whilst I too wait with interest for some real feedback
I can't help thinking that the rider will be in the centre of "it" all the time
Which may well prove to be a major distraction
From what I can see of the mirror on the advert
It is little, if no better, than standard mirrors
Which, if correctly set up, can give a good view of "most" of the road behind you
I have to agree with JP though, that there is no substitute for a "good look" over the shoulder