I have the October 2008 aluminum Macbook - the one not called pro, the one with no backlit keyboard. A little over a year ago I had the RAM upgraded from 2GB to 6GB (they said that was the max, and although I've read otherwise I trust the shop) and replaced the battery. I never expected the computer to last this long - but the longer it lasts, the more I love it. I'm watching friends' 2010 MBPs and 2011 MBAs die, and mine keeps on working. Sure, my processor ramps up sometimes and the computer gets hot, and the 1.4 year old battery replacement seems kind of pathetic - but really, this machine is a reliable and functional beast. It works as well as my BF's 2014 MBA. So what if its airplay and airdrop functionality is limited? I've got a good thing going, with no assurance that a replacement would mean an improvement in quality. Questions: How much would it cost to replace the hard drive with an SSD? What (exactly) would I need to get? Would hard drive replacement guarantee a longer life for this machine, or is there another piece that is likely nearing the end of its natural lifespan? Is this a good idea? Or should I accept the fact that this computer is nearing the end of its life, and money sunk into it at this point would be a waste? Thanks.