okay so i recently got a macbook about a week ago and i am satisfied with it very much. I went to best buy today and played with the macbook air. My thoughts were, I like the multi touch pad a lot. And the screen kills the screen on my macbook. The screen is very important to me. Now I am very basic on the mac, I surf the web, listen to music. Download music and play with pics etc etc just basic stuff. If i go to best buy tomorrow and exchange for an air will i notice much of a difference in speed in anything? what will i be missing out on or will i even be missing out on anything?