I jumped up off the back of Snow Leopard to Mounting Lions about a month ago now, and after a month of usage I'm sitting here thinking - what was the point in that? Now I have app store bubbles popping up, which it appears the only thing I can do is click it, then let app store open to close it. One admittedly good thing is the auto resume for when the machine crashed, but then again, it didn't crash on SL in the first place so... not sure I see the value in a less reliable machine that simply picks up where it left off from. And now when I resume the computer from sleep, which for years only required one button press, now takes several clicks. IE if I click a button on the mouse just once, the MP starts to wake up and if I don't click again, it just goes back to sleep! I'm guessing ML has some built in snooze function. Or maybe since I'm on a MP without SSD, they gave me snooze instead of power nap. Oh and one other feature of Mountain Lion is sometimes I put it to sleep, but the fans keep going. Then I try and resume and nothing happens, so I have to force power off. Its awesome. Are there really any benefits to using ML instead of Snow as a pro user that I have yet to uncover? I'm thinking of reverting.