Joined: Sep 2005
Posts: 3,550
Likes: 1
From: "The Last Best Place"
Bikes: 2005 Trek Pilot 5.0, 2001 Specialized Sirrus Pro, Kona Lava Dome, Raleigh hardtail converted to commuter, 87 Takara steel road bike, 2008 Trek Soho
From my experiences, bike mounted bars tended to vibrate and even absent that problem, their field of view is limited to where the bar is pointing. A glasses or helmet mount solves both issues.
Personally, I use the Take-A-Look in the warm weather months and the CycleAware on the helmet in the cold weather because the glasses fog.