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While you should get a great experience from mac OS Sierra, you may encounter the odd issue – which is why we're here.
But sometimes, believe it or not, software doesn't quite work the way it was intended, and Apple's operating systems are no exception.
In 10.12.2 Apple did something odd, it removed the 'Time Remaining' option from the battery indicator on Mac Books.
Apparently this was becuase it wasn't very accurate, but it's still annoying nevertheless.
We recommend backing everything up before you start installation of the new OS.
Once you've done that though, you might find the installation gets stuck part way through. That's because the progress bar for an i OS update isn't always the most reliable, and sometimes the installation can take a long time to complete.