It is a lot more than a nice TV, and when it ships in 9 months or whatever, we'll learn a lot more about what that means, as they'll be able to showcase more use cases by then.
This might give some flavor of it and how it matches up to other devices (MacRumors YouTube).
https://youtu.be/RSeqXeZHjRY
It's also going to be very inconvenient to share with anyone. It's physically customized for one person (you scan your face with an iPhone so it gets the correct insert), if you need glasses you need prescription inserts, and the Guest account can only make some adjustments for trying it out (which don't persist).