My wife and I bought our first Mac almost two years ago, a 13" MBA 2011 with OSx 10.7 (128gb, 4GB RAM). We install any updates available for it and it is currently 10.7.5 and runs perfectly. We only use it for internet, paying bills online and MS Office occasionally. Will will run into compatibility issues or problems 2,3,4 years down the road if we don't upgrade the OS? Will Apple continue to put out updates to 10.7.x for awhile? I guess I am just hesitant to upgrade to 10.9 since I have been reading about a lot of issues with it right now, our MBA is running great as is, and I am fairly new to OSx still and not sure what to do.