Hi All... As you may recall I was one of the first MR members to post photos of the new 11" MBA.... just FYI it went back the other day and they had to provide me with a replacement. The underneath of the MBA had what appeared to be scratches/cracks which were not caused by me. They said at the Apple store that they were 'machine marks' but it seemed like it was defective or at the very least blemished. I asked them to replace the bottom plate however that was not an option and they had to replace the whole machine! The experience was actually a little funny at the Genius Bar.... another Genius was was severing a customer next to me and told me "James was on the way" so to get my machine out ready. I did so and he stopped mid sentence when explaining about the other customers battery issue, left him and flew over to me to find out what was going on LOL...with the words... "oooooooooooooo.... MacBook Air!"