I wasn't patient enough, perhaps, in trying to adapt to the helmet / glasses mirror concept, I guess... It never became easily intuitive/mindless enough to check and get the right rear-view each time -- I found I had to move my head around a bunch more than I wanted, to move the mirror to get the views I wanted to check (and so, more time my eyes weren't on the road ahead.) On casual straight-aways, it was easier of course. But in the end, I swapped out for a bar-mount Mirrycle Mirror and quickly grew to love it.
(It has become so ingrained, that when I'm a pedestrian walking, and want to pass a slower walker, I find myself involuntarily glancing down to where the mirror would be, on my bike, to check the "traffic" behind me before I overtake the pedestrian!)
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