I have had multiple issues with my Macbook Pro over the past 6 months. The last time I brought my MBP to an official Apple Store (which was in Sydney) was in late August. They had replaced my screen due to dust particles which were stuck under the glass. They had also replaced my logic board, as my computer would turn off 5-10 minutes later if it was not connected to a power source. While replacing my logic board, the technician had scratched the bottom case of my MBP. They offered to replace it, and the replacement had a deep gouge. They offered to replace it again, but this time, there was staining on the case. Of course, they offered to replace it for the third time. When I went back to the store to pick it up, they told me all of the bottom case units had some sort of staining on them, and the one which was stained was the one least stained out of the rest. They had also ironed out the problem with my screen (as it would flicker when I tilted it back) after they returned the bottom case to me for the second time. The Genius told me that that was the best he could do, and they would consider a replacement unit if a technical (not cosmetic, he stressed) problem would come up -in the near future-. Four months later, my screen is again clogged up with dust (and no, I do not work in a dusty environment!). My speakers have a problem (they have a cheap sound, this happened while I was playing World of Warcraft in the middle of battle, it was normal one moment, cheap sounding the next.) I am about to go back to Sydney (I live in Shanghai, but I will soon move to Sydney), and demand that they either replace my screen, replace my speakers (or fix them), and replace my bottom case, or give me a replacement unit with NO problems. So, opinions and advice, please?