You got drunk on the cool aid! LOLThey say you will save 50watts when you are cycling on a flat road at 48km/h. Can you even reach 48km/h on a flat road for any length of time without a hurricane behind you? Read Cannondales own white paper for the small print. Their 7% tipping point is based on a weight difference of only 1kg between climbing bike and aero bike so already that 7% is suddenly not the tipping point when talking about a 6.5kg bike which is 2kg lighter. Furthermore, their 7% tipping point is based on their pro riders climbing at power above 5w/kg. So now if you take a normal human being the tipping point is now only a few degrees. Buy a bike that is say 2kg lighter than the porky System Six and you will be faster up just about any hill. It's basically based on speed more than gradient. If you ride up suikerbossie at 30km/h then the aero could help you. If you ride up at less than 20km/h get a light bike. Nice looking bike though, I like it alot.