Just wanted to share my positive experience with Apple regarding the well-known topcase cracking issue. The topcase on my Macbook has cracked four separate times. I had it replaced under Applecare three times, and on the fourth I spoke with Customer Relations and voiced my frustration. They offered to replace it with a brand new unibody Macbook or let me upgrade to the 13" Pro for $200. The important thing is, if its not too late, to have every crack documented. Every time you call, they keep a record of what you say.