Overall the install was straightforward. It took 2.5 hours including the download. Although during download you can't tell what is going on. Just have faith it's working. Everything worked at first bootup. Issues: 1) Spotlight doesn't show the folder path anymore when you hover over the files list. Holding down Command key is slow and akward. 2) The Dock indicator light is barely visible at bottom of the screen. I used 3rd party app DockDesigner to somewhat fix it. 3) They added a search feature to the Launchpad application. It is still not enough to make this usefull. Just use Finder and I got rid of it from my Dock to save space. 4) ML feels a little more sluggish than Lion. 5) Downloading large apps from App Store shows no percentage indicator what is going on. 6) Make sure you upgrade Parallels or it will not start after upgrade. Also any other important applications. 7) Finder's Favorites bar list on the left side is still grey. Why? I used LionDesigner to fix it. Apple, please stop trying to make the Mac work like an iPhone. You know we have a big keyboard, bigger screens and more memory. And fix Spotlight and Finder. Ok?