Woohoo, go Apple!
First benchmarks: MacBook Air is the slowest Apple machine on the block - Engadget 
Now thats all fine and dandy that its not the fastest, not even close, but if the goal was to be light and portable and promote battery life it can't even fully do that. It may be light and portable, but I have heard battery life is pretty bad, PLUS you can't replace the battery yourself at all. I am having a harder and harder time seeing how they are charging so much.