I own two Homepods and they sound great, really. But Siri is just not good enough. If you thought Siri was bad on your iPhone or Mac it's worse on the Homepod in some aspects and better in others.
She hears you more clearly, that's great.
She takes longer to interact with your home devices that were added to Homekit on your iPhone though. Lights? forget about it.
I can't count the number of times I've said "turn the lights on" for my Homepod to respond "hmm.." "hmm.." "I'm sorry that device isn't responding" or even "You don't have any lights setup" lol but I can go to my phone, hey siri, turn the lights on and boom they're on.
The consistency of the assistant software between the different devices Siri is available on is insane. I can literally say to our Amazon Echo "Alexa turn the lights on" and she does it even faster than Siri on my iPhone that has the lights added right there on device.
So yeah, I love my Homepods for sound quality but Siri is just terrrrrible. So I'm really confused as to why people would want a Homepod Mini unless you've never tried a Homepod before because it doesn't have the sound quality of the big Homepod but has the same bad Siri.
Last thing I wanted to say is I do love my Homepod, for its audio quality. And that's all sadly.