also be aware that the aerobar position will make you feel a bit unstable since it puts a bit more weight on your shoulders, makes steering feel a bit unsteady, and makes you a bit front wheel heavy as well. You need to work on your core strength so that you can support a bit more weight through your torso and help keep your weight centralized and low. Also practice getting into and out of them from various positions on the handlebar and especially if you have a panic stop and have to sit up to body wind break and grab the brakes at the same time.
Although I am not a time trialist I love my aerobars for long steady distances against the wind, and because the "elbow pads" give me yet another hand position for upright riding when my wrists are sore or tired.
good luck and enjoy the experience.
marni
Katy, Texas
Trek Madone 6.5- "Red"
Trek Pilot 5.2- " Bebe"
"easily outrun by a chihuahua."