I don't have a Varia, but use a Take-A-Look mirror. I use a wedge pack and don't have much exposed seatpost, so don't know where I could even mount a Varia, and would need to be able to easily switch between bikes too, since I ride several.
However, many of the roads I ride have bike lanes or wide shoulders. One road is heavily traveled by motorists and has a rumble strip separating the marked, wide shoulder and the traffic lane. Wouldn't the Varia be constantly beeping and why should I be that concerned about following traffic when I have a bike lane? Seems the mirror is just as good here and I only need to glance at it when exiting the bike lane. Seems the Varia is of best use on roads with no bike lanes/marked shoulders.
I agree with those that say having both a Varia and a mirror is best, but I would not give up the mirror for a Varia.
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