I have presently a mid 2012, 13" MBP loaded with a core i7, 16gb of ram, and a 512gb ssd, and I can choose to open my case to make future changes to the ssd. the computer works fine for my purposes. So, my question is a simple one. Does the lack of a retina display mean that I am truly lacking something absolutely significant in my MBP experience, or is it just a nice thing to have. I don't do any intensive graphic work, or play a lot of games, but I do read a lot on the internet and often look at videos. Opinions?