I just purchased a brand new 13 inch i5 1.7 Macbook Air! I am new to the Macbook world, and I was wondering if there are any common defects/imperfections I should know about. I've read reports of people purchasing lemons, so what should I be checking for? I haven't noticed any display defects yet, and I haven't noticed any scratches on the body (although there were bits of factory dust/dirt/grime on the laptop during unboxing). Should I be running any diagnostic software? Also, do batteries vary in quality? How do I know if I got a good one, and does it need to be broken in? Thanks!