I love my HomePods, I got 2 of them paired for stereo sound. I use them from an AppleTV for room-filling sound, as well as sometimes from my iPhone. The sound quality is really awesome.
What's the benefit though? You could get a mid-grade soundbar with a dedicated subwoofer for around $150 (Vizio) and a Echo Dot or Google Home Mini and get better sound quality.
HomePod has exceptional audio positioning and audiophiles have benchmarked it against high end speakers like Klipsch and it's held up very well.
And the benefit for me is Siri. I ask her everyday to read out the BBC News, set timers in the kitchen, set reminders and most importantly play the huge array of content from Apple Music.
"Hey Siri, play some music." (and it's _my_ iCloud library)
"Hey Siri, never play that song again."
"Hey Siri, skip."
I think it sounds great, and I also like that either of us can seamlessly set our iPhones to output from them. I'd like a second one in the living room to expand the sound in that area, and two more for two different "zones" where it would be useful. Siri gives us a laugh every now and then, too.