Well, I won't say the the C-dale is aero by any stretch of the imagination, but I do have a set of aero-bars on it. (profile aero-strykes). My reasoning is that aerodynamics don't differenate between 25 mph in a calm condition vs 10 mph into a 15 mph headwind. Still have an effective 25 MPH headwind. I have noticed that it does help, even going slow, with headwinds. It also makes a nice comfy position to rest the back and arms.
Biggest downside, losing a place to put my handlebar bag. I worked up a substitute with a small fanny pack and some velcro strips, have it draped on the inside of the stem, can put wallet, a few snacks, yada-yada into it.
Steve W.
Who will admit that with full bags, it does look silly with aerobars, but it works for me.