Getting the base model with Iris Pro because I don't need dedicated graphics and already upgrading to 16GB of RAM since I will be using Visual Studio and VM. Considering getting the 2.3GHz upgrade, but not sure how much sense it makes. These are important factors for me: - battery impact of stronger CPU (longer battery life is very valuable to me) - real speed gains by the 2.0GHz to 2.3GHz upgrade - increased heat emission by stronger CPU (and therefore fan speed) Need some advice or maybe some experiences about the 3 points i listed above. Especially regarding battery reduction vs. speed gains. Thanks in advance!