So far Mountain Lion looks like a nice improvement. I like many of the new features. However, some features carried over from Lion need implementation improvements. Apple is so close to having a really fantastic operating system. The Mac is on the verge of making huge market share gains. Unfortunately, a few easily fixed issues are blocking wider acceptance. Versions - Great Idea, implementation needs refinement Versions needs to provide users with an option to change default behavior for specific apps. Versions can be useful in Pages or Numbers but it can be a real irritant in Preview. An option to change Versions default behavior for a specific app could be placed inside of Get Info. My clients and I would love to have the ability to turn off versions for several apps. Restore Save As along with Save A Version - Save As did two things easily, new name, new location. The new system of Duplicate, Save A Version and Export is not as easy or useful as Save As. Windows switchers in particular are irate over the loss of Save As. Resume Good Idea, implementation needs refinement Resume needs to provide users with an option to change default behavior for specific apps. Resume can be useful in Safari but it can be a real irritant in Preview or Quicktime. An option to change Resume's default behavior for a specific app could be placed inside of Get Info. Clients will be satisfied with the ability to turn off Resume. (What if payroll was the last document open)? Please See: http://www.reghardware.com/2011/09/07/apple_mac_os_x_lion_the_nanny_os/ Automatic Application Termination - modify implementation Automatic Termination needs an option to change system wide default behavior. Automatic Application Termination might be useful for some users but it can be a real irritant for experienced users. Clients frequently open up programs such as Grab and Preview and switch to them as necessary via the dock or command tab. These programs frequently don't have an open window, however, they are used for a minute or two several times an hour. When the application automatically terminates without user permission, it is the same to the user as an application crash! Please See http://vimeo.com/34711608 Reopen Windows Next Time Option in System Preferences to eliminate reopen windows next time. (Reduce the frustration of having to recheck this option each time the computer is restarted). It would be nice if Mountain Lion would allow users to permanently set preferences so the question never appeared. AutoSave Initially, my clients and I thought this feature was going to be great. However, we have discovered that we work with a lot of files that we don't always want to save. PDF files, experimental photo modifications, trial letters etc. We really don't want all of these extra files cluttering up our computers. AutoSave needs to provide users with an option to change the default behavior for specific apps. AutoSave can be useful in Pages or Numbers but it can be a real irritant in Preview. An option to change AutoSave default behavior for a specific app could be placed inside of Get Info. Clients will be satisfied with the ability to control AutoSave. Restore option for colored icons in finder sidebar - Colored icons really help in providing tech support to clients. Finder Restore the option at the bottom of the finder window to show number of files selected and the Space available on the hard disk. Restore Quick Look zoom in on pdfs. Columns that resize properly in Kind View". Optional restoration of scroll arrows This is a major issue when the computer requires small steady input - photo and video editing, spreadsheets, databases etc. Please see https://discussions.apple.com/thread/3252617?start=0&tstart=0 Mouse Speed & Acceleration Need an option to set both mouse pointer speed and acceleration curve. (Most frequent complaint I receive from former Windows users). Green Zoom Button Behavior Option in System Preferences to set Green Zoom button to Window Maximize - (Window fills screen except for Dock). As it stands now it is up to each developer how this function works therefore the behavior is very inconsistent. Second most frequent complaint I receive from Windows switchers. Client Comment: "I have looked at the iMac carefully, as my kids have one at home. Even though I'd like to switch to Apple, I find two issues with the Mac unacceptable for my purposes . The inability to fully maximize a program is irritating, as I am used to doing that regularly. Also the cursor movements with the mouse are too jerky. Unfortunately these 2 features will force me to continue down the Microsoft OS path."