I was seriously considering the thinkpad X1; the high-end MBA was a better machine for my dollar. I'm bummed that I'm currently not able to run Linux natively on it; can't wait for the video drivers to get sorted out.
My biggest concern is battery life under Linux. Apple has done a great job with making OS X conserve battery.
The UI has some really nice elements as well. For example, I am continually using spotlight for calculator and dictionary lookups; seamless.
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