My GF's Late 2009 "unibody" Whitebook had some odd plastic crack near the magsafe charger, not sure how it got there - it wasn't dropped. Also on the lid itself, on both ends near the hinges the paint was cracking, very subtle, but noticeable. We thought it was plastic cracking but it was actually just paint I guess. Genius said this was an issue on older plastic MB due to flex, but figured it would've been fixed on the new models. We took it into the Apple Store geniuses, and he said he hadn't seen the hinge paint crack before on the newer plastic MB models so he went ahead and had the MB sent in to repair the cracked plastic near the charger and have the screen assembly replaced where the paint cracking was seen. Went into the Apple Store on Thursday afternoon, got the MB back in hands on next Tuesday early morning, not bad. Apple repair replaced the entire screen assembly, the main unibody plastic casing, the keyboard, and logic board (audio issue). The keyboard and logic board was a surprise but whatever. Looked like a brand new computer when it came back but the system was restored to how we had sent it in, no problems there either. Also noticed the logic board was white visible on the ports on the left side, where the magsafe, usb all are.. instead whatever it used to be. Just wanted to give a heads up for plastic MB owners that Apple is willing to repair any cracks on your MB and this could very well be a future issue as well. Great experience with Apple though!