Hey I dont know what to do. I already ordered my 2,8/16/512 13" rMBP for 2030 (edu Discount) but since i wait for it to arrive i have big doubts. I just realized that i get doubled power and a dGPU for only 350 more. So is it just the portability of the 13" that matters? Is the 15" really that unportable in comparison to the 13"? Any experiences of u guys? Its such a hard descision help.