I'm upgrading from a 2011 13" MBA and am worried about battery life on the RMBP. I'd like to get the 2.6/512/16GB model because I need the extra storage space. I use Aperture with NIK plug-ins and 4GB RAM gets used up right away on the MBA. I'm considering going all the way to 16GB but am worried this will kill battery life. Apple Insider just tested the model I'm considering and only got 6 hours out of it using what appears to be a standard test that another online test easily got 7 hours of use with a 2.6/256/8GB model. Was it the extra SSD space or RAM that used up the juice? I enjoy being able to use the MBA for general email/web surfing without having to plug it in. Photo editing uses up the battery quickly.