The new MacBook Air is great, but be sure to verify what SSD disk you got when you purchased it. Otherwise you might have been given an old and much slower Toshiba disk instead of the Samsung disk that is/was? supposed to be shipped with the new Air.
So why does this matter? Well, simply put, make sure to get what you're paying good money for. And you will actually notice the speed difference if you compare the two disks to each other, even with simple tasks such as unzipping a fairly large zip file.