I don't have much experience of mirrors. We have one on the tandem, but all I can see is the stoker's mirror.
I fancy one of the bar end ones, but I have my gear levers there
I'm tempted to spec one for my commuting machine. Hell, it's already going to have hub gears, a chainguard and a propstand. Why not a mirror? But it'll have bullhorn bars, too, so the natty and discreet bar end ones won't be much good there either
I shall follow this thread with interest.