I currently have as my main machine a mid-2012 non-retina MacBook Pro with an SSD being the only component that I have upgraded so far. Still get by just fine with 4GB of RAM for my uses since I mainly use it for web browsing, e-mail, office productivity, media management & light gaming. I have been with this computer design for over five years ( bought my original Pro in 2010 but after two years had to have it exchange due to a logic board issue) so I feel I would like to have a lighter, more portable and better battery life that the 13" Air offers. I don't use the optical drive anymore for a couple of years now and all my networking is done wirelessly now so losing ethernet doesn't seem to be a problem. My main drawback is that honestly with the SSD my Mac runs and does all I need it to do just fine and probably will do so for the next couple of years. And what worries me about the Air is that I read that the color gamut is 40% beneath even the non-retina's display and after all this time I guess I'm kinda spoiled by the gorgeous colors on my laptop. The colors certainly look washed out when compared to the 13" non-retina, at least, to my eyes but a lot of people on this forums seem to suggest that depending on the screen manufacturer that one gets one could calibrate the display for better performance. I would really like to hear what other people have to chime in given my concerns. Thanks a lot.