OSX Mavericks looks good but are all the applications compatible like Mountain Lion? Will my Adobe CS4 programs work correctly? I tried to look online and nothing really showed up. Update edit... all cs4 apps that I use seem to work very well like the previous operating systems. Like Snow Leopard, and Mountain Lion. Also the operating system seems more fluid than before. And it manages memory and CPU usage very well on this operating system. The preview got a little bit slower for images but other than that all the mountain lion apps works. That means you are in a okay position to upgrade. I would do a disk repair, Pram reset, and also a SMC reset to increase the boot time. It was a very slow boot time until I did these steps after the install. Upgrade its good!