Quote Originally Posted by PscyclePath View Post

They are NOT for group riding, because your bike handling will be a lot more squirrelly, and your hands are far, far away from your brake levers. It's very bad manners to use aerobars on a group or mass event ride.
+1! Also, in a crash, aero bars can do more damage because they protrude. Please don't ride with aero bars in group rides!