Ive just bought some as i'm returning my 748r to road trim. They have not arrived yet, but will let you know what they are like once they are on.
less hassle removing seperate indicators and mirrors for track use and i think they look quite different too. visibility from Duke mirrors is pants anyway so it cant be any worse...i'm more concerned with if they will suit the lines of the bike or not.
I have these on my 748. only criticism i have for them is that the bolt they supply is of a softer metal than the original. They work just fine and offer what I think is an improved view over standard. Would have been nice if they also supplied blanking plates for the air tube indicator mounts. I'm happy with mine. You can see them fitted in my avatar.