I use my current MacBook (in sig) mainly for editing in FCPX. I'm after a larger screen now, and since I never use the optical drive in my current MBP, I'm considering the retina. Since I want this one to last as long as possible, I was prepared to go for the 2.8GHz with the higher cache etc, to help with rendering as well. Does anyone have the 2.8?? What's the heat and battery usage like? I would assume battery usage would be the same unless I'm really pushing the CPU hard? Is it the same principle with heat? In theory, if I'm only casually browsing the web, for example, the CPU would be underused, hence emit as much heat as the lower clock CPUs? Whereas if I'm rendering etc, then heat will be higher due to the faster CPU? Anyone with the 2.8 have any issues??