My friend has one and it’s a lovely speaker. Sounds really nice and works well with Apple Music. I believe it works wih Spotify now after iOS14 but can’t confirm this as my friend has Apple Music. Not sure if anyone can confirm this as I think this would make it a better seller and something that should be pushed more.
The HomePod has not updated to iOS 14 yet, so doesn't have third party audio available.
once it does update, the individual apps would still need to update.
Take a look at Sonos.
-they sound great
-they're cheaper ($179/$199 depending on if you want voice assistant or not, or the Ikea branded ones are $99)
-they work with more music streaming services
-the Muti-room audio works better
-you can control it from any device on your network. (if you start music on the HomePod from your phone, you can't control it from your Mac, you can do that with sonos. And if others have android, they'll be able to use them)
-you can get ones with HDMI inputs, which give you a better and more stable audio connection.
-You can get a pair and use them as surround speakers.
Airplay as a default audio out also tends to have issues. If you're planning to use hompods as the main speakers for your TV, You might want to re-think. I've seen several threads here where it just stops working, or requires some tinkering to get it working from time to time.
not sure if it's fixed yet, but you couldn't airplay to a stereo pair of HomePods from a Mac.