I have to use a mirror since breaking bits of my neck 15 years ago. It is the primary way I see behind, only doing the turny neck thing before an actual manouvre and quite rarely now when rolling along - I've spent loads on them and discarded anything that was no good or didn't let me feel safe. I've not crashed or veered into the path of anything and I know exactly when stuff is going to come by me because I've always got a weather eye out behind as well as never losing sight of the road in front.
The only two I really rate are
Zefal Dooback is the absolute bees knees of mirrors IMHO. They are designed for flat straight bars and have a clever ball joint adjustment that pugs directly into the bar, they have a 90 degree ratchet to lock them in position or flush to the bike for parking. but the will fit onto a moustachio'd type bar and by the looks of the link in the OP would fit fine onto that bar. I have a Cannondale Street Ultra with similar raked bars and it fits fine.
the mirror size is great, the field of vision is brilliant, it is vibration free as it plugs direct into the bar and it is a robust mirror surface. They are side specific though so make sure you pick a right hand mounting one.
The only downside is that it does stand up proud even when folded in and I've lost my most recent one to some numbskull in the busy bike shed managing to snap it off in some way. it may be because I'd got it bolted so tightly in though that there was no play in it.
the one I've always used on my proper moustache or dutch style curve bars is the Zefal Spy Mirror, its a bit smaller so has a slightly more convex face but still gives a realistic image and excellent field of view. they grip and bungee on, are infinitely adjustable for rake, tilt and pivot and sit pretty much anywhere on the bike. They're small, unobtrusive and would sit perfectly on the end of the bars for that bike and wouldn't spoil the aesthetics at all.
I've got one on both ends (OTT, one is perfectly adequate, but it makes for a nice symmetrical look to the bike) and have absolute vision all round and no blind spots at all.
again they attach directly to the bike so no vibration or blurry image and are extremely robust if you drop the bike or have to park it against a wall etc, they'll not break or get scruffy with scratches.
Drawback - the rubber fixing can be a little lacklustre after a while. I've put a bit of sticky velcro on my bar and inside the mirror clip just to help it out.
overall though compared to the many mirrors on arms that I've tried, whether helmet or bike mounted that wobble and vibrate at the first sign of a bump these two are head and shoulders (no pun intended) better than the rest.
sorry for the long post, trying to give a full road test to both for you, I'd highly recommend either.
we also use our mirrors to keep check on each other. As you say, when a vehicle does approach we always make sure they know we have seen them and wait for the right place to wave them by. Most of the time there isn`t enough room for them to overtake till we get well over so a mirror is a must. Before I fitted a mirror on my bike I was for ever thinking that the wind noise through trees etc was maybe a car and my neck ached more than my legs
