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