I'm in the market for new handlebars, and I'm considering aero road bars. It seems that it's a no brainer since such a significant portion of wind resistance from the bike comes from the bars; the big downside is cost.

Zipp
Enve

I'm curious what y'all think about aero bars, and why they're not more widely used, since most of the advantages of an aero frame can be had by simply using aero bars...

Thoughts?

PS - I get that the most important thing about aero is body position on the bike, and I'm working on that...