Here's the deal. I ordered a 15 inch mid 2015 rMBP the other day from a big box retailer. However, it's 256 GB. I just found a deal where I can get a brand new 15 inch Mid 2014 rMBP with 512 GB for $100 dollars more. Do you guys think I should return the Mid 2015 for the mid 2014? Is the slight price difference worth the storage bump? I guess what's most important is: what exactly were the spec upgrades from mid 2014 to mid 2015? Other than the trackpad? Any noticable differences? (Realistically, for a relatively casual computer user)? I have a 1TB external HD that I dock to my monitor when I use my notebook as a desktop. Usually for media storage. Small, light, and frequntley used files are stored on the internal AND the external HDD. Thanks.