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>Which still means that, if you buy a 2014 model, you might get a machine that's slower than the 2013 model.

I think what you mean is "You might get a machine that's slower than _a_ 2014 model". Assuming every 2014 model performs at the baseline, unless that baseline is lower than the previous generation's you're still getting better performance than the _official_ 2013 model.

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And which model is the "official" one if not the one that I bought in the Apple Store? There is no official and unofficial one, they're all sold under the same name.

If I have a 2013 MBA I expect the SSD when I upgrade to a 2014 one to be at least as fast as the old one.

OK, let's put it this way: Apple doesn't guarrantee you a specific speed, and doesn't tell you you'll get a specific SSD model in your Air.

It just tells you you'll get a speedy SSD of X capacity (true), and you're not supposed to obsess over manufacturer and a couple percentage points of performance. Else, you wouldn't have bought the Air, but some custom rig.

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