I have had my 1.2GHz rMB for about a week now. I am absolutely loving it so far! However, I am only seeing about 5-6 hours of battery life doing very normal web browsing, email, itunes tasks. Apple claims I should be getting around 9 hours. I am running OS X 10.10.4. I did not migrate my machine from a previous backup, it was a clean install. I have checked the activity monitor, and nothing seems to be eating up a lot of power. Have other people been experience this amount of battery life?