Lisa, our people here at Part-People found your MacBook Air comparison to have a very familiar ring to it; meaning we had basically the same thoughts and reactions. We reached just about the same conclusions that you did, although we did not physically put it next to an MBA.
On Jan. 13, 2012, our Tech Journalist included the Dell XPS 13 in a News Article entitled "5 New Ultrabooks / Laptops + 1 Ghost = 2012". I think our writer came to my office after writing that article, and said something to the effect that he was pretty sure I was going to want that XPS 13, and said he thought it might be the best notebook Dell has ever made. What I saw at that time caused me to pre-order one for my own use, even before it was available.
The first day possible, Feb 27th, I completed that order, and we followed-up with a news article entitled, "XPS 13 Ultrabook Specifications – Dell Hits One Out-of-the-Park". Our journalist does not always have a positive opinion of Dell products, and you will clearly see that reflected in articles on our Technology News section. I certainly did not choose the title for that article, and I have never told him what position to take on any product we cover.
That one is just for fun, but we are following up with a complete series of do-it-yourself, how-to-repair video tutorials. We kind of think the build-quality of the XPS 13 is so high, it may be a while before anyone actually needs a repair video for it; but, in the near future, they will be available at the following link: Dell Laptop Repair Manuals and DIY How-to Tutorial Videos .
Let me know if you had as much fun watching the hands-on teardown video as we had making it.