If you watch the Keynote there'a a demo video that shows that when 2 are paired they dynamically adjust sound output to compliment each other.
I did watch it and there's a difference in what "compliment" may mean and the idea of 2 being paired up as excellent stereo Left & Right speakers, as was the context of the conversation. Compliment could mean that they'll both sync up their sound output to try to generate about the same
volume throughout a room (which is what I suspect it means). That's different than what stereo means in the context of the conversation. For example, does compliment mean the one to the left will optimize the stereo left channel and the one to the right will optimize the stereo right channel sound? Maybe, but that wasn't communicated. Of course, the trick for trying to believe it anyway is how would each speaker know which is left & right and the location of the optimal listening position to set themselves up that way?
Bottom line: several people are suggesting that these CAN replace speakers in a good stereo or even home theater setup. The implication is buy one for the left and one for the right and they'll outperform classic speakers set up that way by working together. I can't absolutely refute that suggestion but I don't automatically buy it either... until someone can offer definitive information that "compliment" means that.
These are for listening to music primarily. I wouldn't use them for an AV setup - they won't replace a dedicated 5.1 setup for example - anybody with knowledge in this field would tell you that.
I agree but that's the conversation within which I was participating. I suspect this in a fine smart speaker but it should mostly be left at that. Some in this thread seem to be trying to puff these up toward being the be-all, end-all speaker for ALL purposes. That, I don't believe at all but some puffery keeps flying. I figure by the time this thread ends, these will lay golden eggs, double as Star Trek transporters and food replicators and even slice bread (but only
these slices of bread will be properly sliced).

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Haven't read through every page, so don't know if it's already been asked:
How do we turn the volume up and down? No physical buttons, right?
Will it be, Hey Siri turn volume up to 70%?...
Or maybe a dedicated remote app like the Apple TV?
There is a reference on the Apple site that you can adjust volume by touch (on the tops of the speaker). Here's the quote: "Tap the top of HomePod to play, pause, or adjust the volume."