On the original Retina Pro we were promised 7 hours of productivity. In reality, I was able to squeeze out a maximum of 5, even if I turned the screen down and kept my activities to things like browsing, word processing, email, and other low key stuff. From what I observed on other comments over reading a lot of threads, most people also got around 5 hours of real world usage from their 15" pro retinas. I don't remember anyone saying they got the full honest to goodness 7 hours of productivity, unless their screens were set to super low and they did nothing but browse articles on Safari. So my question is on the new retina pros, how has that changed? The advertised life is now 8 hours. Is it really more like 5.5 or 6 in real world usage? I would like to hear from people who use their computer actively, not just listen to music with the screen off. Basically, stuff like iWork or Office, Safari, Mail, Skype, Photoshop, etc. What real world usage are you getting from the 13 and 15 inch versions of the retina pro?