We have three & use them for all sorts.
I'm currently playing Heart Yorkshire on the kitchen one - she does sometimes ignore that request and play Hallam FM instead though .
Dd2 is listening to one of the Harry Potter books on hers. And dd1 is streaming Hamilton from Spotify again.
Myself and dd2 use them for timers (cooking and teeth brushing, respectively). I set reminders and make various announcements through the day.
I can set a reminder for dd1 in a morning (normally) if there's something she needs for school, or I need her to do something before she leaves (I'm first out the door usually).
Dd2 often uses it for homework help if I'm not sure (OK Google on my phone also responds to these questions & is usually more reliable, though).
Only downside is sometimes it can't "hear" me properly (over running water or whatever) and so doesn't do what I ask, or when t'interweb connection isn't great & it tells me "hmm, I don't know that one"
. I sometimes think it's just done for the day tbh.
The speaker/microphone must be quite good though; it picks up me announcing to dd1 that it's bed time from the living room.
Ooh also, it plays sound effects if you say the right thing...dd1 can get it to do a circus "ta-da" and dd2 birdsong, before it makes an announcement. But I've no idea how 