The first time that I saw the MBA at my local Apple store, I played with it, asked a few questions of the sales associate standing at the table, hugged the MBA and left the store knowing I'd be back when they had them actually in stock for purchase. A week later, I went in there and announced to the sales associate who had immediately approached me and offered his assistance that I wanted an MBA, the SSD model, plus the external drive and the ethernet dongle. He seemed a bit surprised -- I think because I hadn't even gone near the MBA table, hadn't asked any questions, had just stated what I wanted. While waiting for my MBA to come out to me from the back room, I looked over at the table where they were displayed and saw several people there, including a sales associate......
Right, the MBA is not for everyone, and I think Apple realizes this. Those who are in an Apple store who have the opportunity to touch and play with all the various models are definitely at an advantage as compared to those who cannot physically see and touch a machine until it arrives on their doorstep from the Apple.com site.
For me, the MBA fulfills a specific purpose and need, and I have other Macs in the household which will fulfill any needs that the MBA cannot.... I left the Windows world a couple of years ago and there is no way that I'm ever going back there, so comparisons between the MBA and any new machine that runs Windows are just not of interest to me. But that's just me.... and for others it may well be significant to see and analyze/compare the differences between various computers, whether it be the MBA vs the MB or MBP or the MBA vs some machine which runs Windows. Differences make the world go 'round......