This is the performance difference. And Core i7 makes negligible difference over the i5. http://www.barefeats.com/mba12a.html http://www.barefeats.com/mba12a.h

This is the performance difference. And Core i7 makes negligible difference over the i5. http://www.barefeats.com/mba12a.html http://www.barefeats.com/mba12a.html But I have both a 13inch MBA and 17inch MBP and the Air is unusable for any serious development work. Screen is simply too small.