I currently own a 2009 MBP, but we could use another computer in the house. I would give the MBP to a younger sibling. The thing that makes me nervous about the MBA is not being able to update the RAM. I could care less about the HD since it has a SD slot, and I am thinking about setting up a media server in the house anyway. I am just nervous if I put down serious dough for a 2011 MBA it will be obsolete in two years. I thinking the most demanding thing I will be doing on the thing will be playing SIMS 3 and using Lightroom to edit photos. I know computers are not meant to last forever, but Apple is expensive (worth it in my opinion though) and I really can't afford to be buying a new computer every other year. So honestly, people, how long should this thing last with only everyday usage?