[nezza-_-]

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.

[coldtea]

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.