Maybe I'm just being a little too observant, but i just feel like it takes a longer to open word or powerpoint and even when navigating files, i feel like i see lag. My macbook pro is a 2011 model. Im just wondering if anybody else has been seeing any problems? And the increased battery life they talked about, i haven't personally seen it yet. Also my loading circle has popped up way more than usual in this last hour than i have ever seen.