I was considering ending my Pandora subscription until I realized that streaming music from Pandora, on my iPhone, to HomePod, via AirPlay, works perfectly. (AirPlay, which uses WiFi, has a much better range than Bluetooth.)
This morning, I played music on my Mac, with iTunes, while streaming it to my HomePod. This added an unexpectedly intense depth to my experience as the music was in perfect sync from both sources. It's a cheap version of surround sound.
I've been considering the thought that went into what HomePod currently does. I know there are more features to come, but the current level of integration with iCloud, iTunes, etc is impressive. For example, when playing music on my Mac while streaming it to HomePod, if I ask HomePod to stop playing the music, it also stops playing on my Mac, which is exactly what I expected. If I ask HomePod a question, the music continues playing on my Mac while the music on HomePod fades out as Siri answers my question and then resumes playing.
Plus, I like that I can use HomePod to control other apps (see video). Very nice.