I'm spoiled! I ride a MUP on a daily basis that I practically have to myself on weekday mornings. I actually ride almost the entire 30 miles of my ride on aero bars. I don't have the built-in-to-the-handlebar type, instead I have the clamp on type and I never use (or suggest using) them when group riding or riding on a public road with traffic because there's no way to brake in a hurry or shift if you need to. However, if you are on a road with absolutely no traffic in sight, they are the way to go. When I don't ride the aero bars, I am usually on the hoods, but I do ride the drops a lot just to change positions.