It's bizarre to me that coverage of these products rarely if ever mentions the massive distinctions between Google and Amazon, on the one hand, and Apple, on the other, with regard to the privacy of user information. For myself, it will be a cold day in hell before I put a Google or Amazon product in my home that is designed to record what's going on there and send the information to those companies to mine and monetize. Apple, by contrast, has a vastly superior record and approach; they're far more trustworthy with that kind of access. So Alexa and Google Home products are an utter non-starter for me, and I'm frankly gobsmacked that any meaningful number of people find them tolerable.
I currently have a fairly extensive Sonos network in several rooms of my house, but certainly nothing Alexa-related or containing a microphone. If it becomes possible to integrate a HomePod with that network (and it appears that that may be possible in 2018, depending upon how and when Sonos implements AirPlay 2), I'll certainly check the Apple speaker out. I would be even more interested in the product if I didn't already have plenty of money invested in (and rooms already served by) Sonos-connected speakers. But consenting to have my house bugged for the benefit of Amazon or Google? What kind of idi... er, consumer would do that?