No. 66

The aim is not affected by rough roads, wind, or taking your helmet off and on.  Set it up once and you're done.

The best feature for those who need it.  Ride across town to the race, a training session, or the trailhead, then stuff it in your pocket (it was invented on a ride to the trail). Also makes helmets easier to stow. 

Provides a large field-of-view, allowing full view of the road.

Satisfy your inner gear stylist. Do it.