I recently had the greatest apple store experiences. My 2011 macbook air 13inch had a slightly blown out speaker which was making buzzing noises. So i brought it to the apple store hoping for a speaker replacement. At first, the genius representative said he will replace the speaker...then apparently apple is collecting the 2011 macbook airs to check for flaws....so the representative went to the back and he got me a new air. Brand new not refurbished. He also mentioned my warranty starts again from that day...that was a great apple store experience.