- Ease of use Mountain Lion includes many great features that make your Mac easier to use.
- Speed Startup speeds seem slightly slower compared to Lion
- Configurability The user has a reasonable amount of configuration. There exists other programs which allow you to config CLI options more easily.
- Ecosystem (apps, drivers, etc.) Lots of great apps - drivers are provided by most hardware manufacturers now.
- Openness Gatekeeper closes down the system a bit, but since you can disable this feature openness has remained the same.
That a side I'd recommend anybody to upgrade to Mountain Lion. Finally App Store sends notifications when you have updates your App Store Applications, you no longer have to open App Store to see updates. Apple removed the animation for changing months in Calendar(iCal). This has made the application almost usable again.
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