I'm running an "old" 2009 MBA 2,1.
This thing runs great...I know it is "old" but it doesn't feel old. The SSD makes this thing fly against anything with a HD.
I'm starting to want more than 2GB of RAM. I can handle the 128GB SSD with no issue (in fact, I have a Bootcamp partition of about 50GB!) since I am comfortable with using my network backups.
I'm going to be looking seriously at upgrading when the new Haswell processors come out. I can wait, this thing is the best laptop I have ever had (and I've had a 5300, a 1400cs, a 2400c, a Lombard, a Pismo, and a Hackintosh MSI Wind...I've also been using Dell crap and decent Lenovo's at work).
BTW, the recent priced drop on Air's was sweet!