As someone who loves Apple products, and tried to build a HomePod based home system, I would strongly advise AGAINST buying one unless you are a very specific person: live alone, no pets.
First the good: the sound is awesome. Siri can hear you summon here everywhere in the house. They look good.
Now the bad: they dont do TV audio/voice very well, nor do they do surround. So, they are basically ONLY for music. And they don't take any inputs except apple TV or your phone. Even airplay receivers can't cast to them. So its VERY limited in what it can play. If you use Siri, and have more than one person in the house, you can't use siri on HomePod.
Why? well, if you leave Siri on for the HomePod, it associates with one persons iCloud account. That means every time anyone asks Siri to do something ,it does it through that persons phone, or to they calendar, and gives them access to all Siri functions on that account/phone. And because HomePod always hears "Hey Siri", no matter where you are, its really hard to use your own devices...unless you activate siri manually on the phone, defeating the purpose. Of course, you could turn off iCloud personal information and leave Siri on...but then anytime you say "Hey siri" in your house, you get a full volume, 5-10 second sentence from the HomePod about what it can't do. So to retain your sanity, you have to turn Siri on the home pod off if you live with more than one person. And if you do that, it limits the HomePod even more.
Its also unrepairable, so if anything happens to it, its 280 bucks to repair it...like easy, a cat/dog nibbles on the mesh covering. At that price, you might as well just buy a new one.
I own two (three before), I probably will never buy one again. You are far better off buying into a Sonos system. I avoided that as hard as I could, but thousands of dollars, multiple returns, and months of research shopping have shown its probably the best for most people...its far more versatile. Your other option is a "real" home system with an airplay receiver, but that's more work.