It totally depends on what you use it for.
I love the Macbook air for travel, but for video work and Image work (when I need to be mobile) it has to be the Macbook pro.
If I'm working at home, it's my Mac Pro with Dual monitors - the screen real estate makes working much faster and easier.
For most people thought the air is great, you just don't need to features of the more powerful systems for email & web browsing.
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