I set AU to download the updates in the background and notify me. I have had times when the updates install and I'm busy doing something, then I get annoyed by the "reminder to reboot" that pops up constantly. Letting it download but not install gives me the opportunity to review the updates and decide if there are any that I don't want. I find that this setup saves me the time of going to the site all the time - especially on latptops or tablets that aren't running all the time.
I still visit the Microsoft Update site occasionally so I can install other updates that aren't critical.

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