Older and Wiser
I used a MBA as main machine until the MBPwRD came to the market. It ran without problems and served me well for a year. I had the same setup: VirtualBox and Ubuntu.Yes, the Air is good for the average MBA. However for hard-core programming I can't imagine running on an ULV processor (or on a 13" screen). Then again, I have been wrong before
Also, AFAIK the MBA doesn't use a ULV processor. Moreover, Apple doesn't use a ULV processor on its laptops.
So add this to your "wrong" list.