Hello, I run Lion on a Mac Pro 3,1 and a Macbook Pro 5,1. The Mac Pro is a business machine, I depend on it for a living. Laptop is less important, it's portable, but everything on it is on the Mac Pro and backed up at least once if not twice. I'm on Lion because I upgraded the Mac Pro to run Avid Media Composer 6. Now that I'm on MC7, it's supported on Lion, Mountain Lion and Mavericks. Other important applications I use include the Adobe Creative Suite 5 (CS5), and it seems that to play it safe, CS5 should be used on Lion or Mountain Lion.... I read 'iffy' things about Mavericks and CS5 and am not ready to begin renting their new software suite. I am wondering if it's worthwhile to upgrade to Mountain Lion. The thought came about when the App store yelled at me that I couldn't install some software I purchased, because they updated the app recently so that it can't work on Lion any more (but Mountain Lion will offer you last compatible version). Also, a friend recently had to upgrade to ML from Snow Leopard when he updated his Protools rig. Can you please give me reasons as to why I'd want to, and why I wouldn't? -Is it snappier? (little lol) -I guess it's more likely to be supported then Lion for security updates? Anything else functionality wise I'd enjoy? Trying to get some perspective as to why I would upgrade the OS or just leave well enough alone. It might be good to point out that I don't use Launchpad, or Mission Control, just the dock, quicksilver, keyboard, and a mouse. Thanks. Not interested in upgrading to Mavericks.