I'd say the biggest upgrade/difference will be going to an all-carbon frame. You'll definitely get a smoother, less-harsh ride, resulting in more comfort. Another, not-insignificant, change will be lighter weight: frame, components are lighter, which is certainly a benefit. The Avail also has a 10-speed 105 drivetrain, giving you one more than your current bike, allowing you more options in finding a comfortable cadence. Plus, new 105's shifting performance is very solid. Michelin Pro Optimum tires are top-notch, much better than the stock Dynamics on the OCR. If you're convinced that these benefits are worth buying a new bike, sounds like the Avail is a great deal. Have fun shopping!