I am thinking about getting an older MBA (2010, maybe 2009) on craigslist (yeah, yeah I know the problems with that but I have had good luck so far on there) and had some questions. First, do they heat up really fast? I have a 2008 macbook and it heats up incredibly fast and I am looking for something that does not do that. I know this is a broad question, but maybe someone can help me. Second, what are the main differences to a SSD? Not the biggest issue, but I have heard they are awesome. That is really all I have for now, and that heating up thing is a big one. Hope someone can help me. Thanks for your help!