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I upgraded on Day one and it has been great. It takes some getting used to but totally worth it. I know others have had problems. The biggest and best change in my opinion is Safari. Much more stable, less finicky, faster and much more pleasant to use.
 
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I upgraded the iMac at my office, and I haven't had any issues. The OS and Apple apps are much snappier, and more polished when you first make the switch. After a few days I forgot I was even on the updated software. It was a nice, and easy transition.
 
I've been running it for the past two weeks, took a good day or two of using it full time to get used to but so far no issues. Dislike some of the changes to notification center but was able to adjust
 
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