I have had my MBP since 2009. It still runs pretty well given its age - with the exception of the battery. My battery started declining a little while ago. I am (obviously) long out of warranty and I assumed that I would just have to pay the full replacement price for a new battery (this is the first uni body with non-removable battery). I also noticed as my battery got worse that the track pad was loosing its ability to do the press down click. I believe at one point, I had heard stories of battery swelling causing the track pad issue. I've seen on the iPhone forums, that if there is a battery swelling issue, Apple will often replace them even when out of warranty. Might this be the case for me?