The Orca Aero could certainty get you through a century. But, unless you are the type of rider than can average 20mph+ for the whole ride, I don't think it'd be ideal. You won't gain much form the aero aspects, and just end up be slowed down by the added weight and harshness...aero bikes are great for smashing the flats, but aren't yet to the point where they make great all-around bikes. For most riders.

That being said, I'd still rather have the Orca Aero over the Gan...but, I'd rather have the standard Orca over them both.