Garth, If speed is the goal then I would have to agree that aerobars do Mke a difference. My experience as shown that using aerobars enables me to ride a good 2 mph faster with no extra effort; in fact the extra speed seems easier to maintain. That said there are some trade-offs in handling and climbing that need to be allowed for in one's riding style. If I want to go fast with a stronger group of riders, I always take the Mercian which is equipped with aerobars. If the pace is more moderate then any of my bikes will do.
Paul Patzkowsky
Longmont, Colorado