My bike blew over at a porta-potty stop on a windy ride, but the mirror folded-in just fine and survived.
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The mirror did fold in, and even went so far as to pop off of the brifter. While the unit remained in one piece, the mirror itself cracked from the impact. It was a choice between spending $9 for a replacement mirror, or $15 for a whole new unit. Since I broke a 1st generation Mirrycle road mirror that I refused to give up with the recall, I decided to spend the extra six bucks and get a 2nd generation model.
I haven't had any issues with keeping it where I want it. I hope this isn't a function of the pre-recall models allowing better tightening versus the 2nd generation.