I have an April 2008 Macbook running 10.6.8. Looks like I just miss the cut-off date (late 2008) for installing Mountain Lion. My computer is working well and that is why I haven't installed Lion. Some of the newer Apps and Software are now requiring Lion. Since I am not upgrading my Macbook yet, should I install Lion now that is has settled down - and will that keep me going in good shape for another year?