I currently use a road bike with clip-on aerobars for my TT's. I don't typically use aerobars when training on the road, as most of my rides are less than 30-35 miles so that I can focus on speed and intensity. In fact, I seldom even go into the drops during my training rides, pushing myself to maintain speed against headwinds while on the hoods. I feel this makes me faster at TT, where I do stay on the aerobars for the whole 10 miles. At least so far, I've seen significant decreases in my times from TT to TT....

When I buy a TT bike, I'll remove the aerobars from my roadbike, and remount them only should I ever do a century. And I'm really eyeballin' the Hancock Century this year.