I had bought 2 and returned 1 13" 128gb Air. I got a Speck Clear case before I even got my MacBook Air. I observed my first Air carefully for any scratches there were none, and I put my clear case on. I then noticed that my Air had a Toshiba SSD, so I exchanged for 1 and luckily got a Samsung SSD. I also noticed that this time, my air had (I'm a little color blind) reddish brown spot on the top, and I saw this scratch/scuff before I even took off the little plastic cover that covers the air. I took it off and try rubbing it with a microfiber towel and some Staples Screen Cleaning Spray. No luck. I just put my speck case as normal and they said I could do a max for 1 exchange so I can't return or exchange anymore. It is really annoying, any ideas?