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Nothing says "Fred" like anyone using aero bars who is not actively participating in a time trial or triathlon. Will give slack for a day or two before an event to slap them on your bike for practice. Even my friends who were professional triathletes only put on aero bars for doing events, not to train.
To answer your question, they do help. Forces you to keep your body in an aero position. But being at your absolute minimum weight will help more. Also for doing time trials the ability to push a big gear for extended periods of time helps more as well. But when everything is said and done, for someone who is in shape aero bars will shave about two minutes off your 25 mile TT time (standard distance for time trial events in cycling).
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