I glance down at my 11 speed cluster sometimes, to make sure I am in the right gear when a small hill approaches. That's part of the fun of mechanical shifting and riding a bike! That said, if there was an electronic diagram in a display on my Garmin, showing what gear I was in, it would be cool, only to keep my eye on the road instead of looking down.
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'11 Time NXR Instinct / '79 Paris Sport by Moulton