I have decided to buy a rev C macbook air this christmas. I just have to consult on some potential issues about the overall user experience that my friends point out a lot. 1. How would you rate the durability of a macbook air? Do you need to be conscious of it or can you just treat it casually without fear of wrecking it? 2. Is the hinge problem resolved in rev C MBAs? 3. Does the gray line issue occur often and is it really disruptive? 4. Does the MBA heat up often when watching flash video/ movie files? Please compare it to a Macbook's heating up (my sister has one.) Thank you. I would really appreciate your help.