Something to consider (this has been popping up in a few reviews)... Drive throughput has been trashed due to the "consolidation" of the storage chips. For base models, you're looking at half the transfer rates (this includes the Mac Mini as well). You need to up the storage to get the speed back to something comparable (and even then it's usually still slower). Depending on what you do, this could affect you.

Also, keep in mind the airs are passively cooled notebooks (vs the pros which are actively cooled).

When I'm scripting, neither will really affect me. But if I'm running VMs to test things, the storage speed and the cooling will... I suspect you're somewhere inbetween.