Just curious, I have no interest in upgrading to a 2013 air anyways but I was just wondering how much quicker the 2013 13" base is relative to the 2011 13" base because that's what I have. I think battery life is the main difference, and PCIe SSD is supposedly quite a bit faster. But for what I'm doing, not sure I'd notice the difference besides benchmarking. I hope to ride my laptop out for a long time. Also is it true they aren't as well constructed as before? Thought I read somewhere the shell is thinner to accommodate a slightly thicker battery.