My wife and I travel for photography. It is not a business but a hobby of ours. We do a lot of high speed photography and I'm dying using my current laptop when we travel. We both have thin laptops, I have a Lenovo Yoga 2 and she has a Carbon X1 Touch with the hires screen. Both work well from a visual standpoint for reviewing what we've done but the battery life in Lightroom sucks and while they are fast for day to day things the low power consumption i5 is driving us nuts in Lightroom. A MB Air would present the same problem, too slow of CPU, not enough battery. I need a desktop replacement. So the only thing that really fits is a MB Pro. Better construction, highest CPU available with a decent screen, etc. I'd have to goto a workstation class PC laptop and I do not think the screens are as of high quality. We both get about 8-9 hours out of our laptops doing basic work, start Lightroom and we're lucky to see 1.5 hours. So I want to pick up a refurb Mac Book Retina 15, its ONLY use will be for Lightroom when we travel. The Feb unit has a higher base clock speed but is older architecture, the newer is slightly lower base but newer architecture. Plus the $500 price difference between the two. I'm not too worried about storage, we always backup to external drives because of the amount of pics we take. We're at the 12 Hours of Sebring this week and so far between the two of us racked up 8,000 photo's we have to sort through. For those familiar with the current models will one fit the bill versus the other, or just save the $500 and get the Feb model? Thanks!