It's also cool to do this with savings pots. When people have a hard time saving, they'll say things like "what's the point in saving £10 a month towards X, that's nothing". I usually point out the annual figure, since a lot of people don't think that way.
That said, personally I do this too much, and it can make it hard to spend and too enticing to save. But that's a different topic..
Am I missing something, or would basically any old smartphone work in place of this? I have a Pixel which sits in a cradle and takes care of anything I'd use this for. I guess a physical button or dial might be nice, but I have a volume dial on the car dash.
Seems plainly obvious that it'll require a sub. It's a Spotify box.