I ride on aerobars both on my TT bike with a very aggressive position and on my hybrid with a more relaxed aero position.
Basicly I ride on my aerobars about 90% of the time all year long.
Ignore everyone telling you that they don't handle well on descents or inclines or winding roads ... those comments surely come from people that aren't completely accustomed to their aerobars yet.
Obviously in tight turns or on very steep hills you don't want to be in your aerobars, but once you get used to it you can quickly switch to your basebar and back.
Aerobars are simply the most comfortable way to bike ever, once you get used to them, of course.
Especially for long century rides I wouldn't want anything else ... the comfort for back, neck, shoulders, elbows and especially wrists is simply unsurpassable.
Did I mention you have to get used to them already? Oh ... I did