Jason Snell and Dan Moren pulled together a terrific walk through of macOS Sierra.

One tiny nit, concerning Siri:

Activating Siri brings up a floating window with an audio waveform, and then displays the results of your query in that same window. (You can choose what microphone Siri uses, and whether Siri speaks its results aloud, in the new Siri pane in the System Preferences app.)

When Siri returns answers to your requests in that floating window, that’s not the end of the story. You can drag and drop, or copy and paste, results into other apps, Many results also come with a plus icon in the top right corner, allowing you to pin them to the top of the Today view inside Notification Center.

And:

This leads to a few uncomfortable situations. Even Apple’s demos show off that if you say something like, “search the web for pictures of old computers,” it will provide you with an awesome collection of images—any of which you can drag anywhere and drop into something like a document or presentation.

My 2 cents here, this is a web issue, not an Apple issue. You could make the same issue with a simple Google Images search. Your copyright obligations have not changed.

Note also that Jason did have sporadic issues unlocking his Mac using his Apple Watch. Not sure if other folks are having this problem but, for me, the Apple Watch unlock has been bulletproof. The only time it fails is when I turn Bluetooth off on my phone or my Mac, both of these BT connections are required for this chain of unlock to work.

But I digress. Read the review. It’s worth your time. Jason and Dan are terrific writers and the review is both informative and incredibly easy to absorb.