Wow!
So much better than wandering around your living room, banging into furniture, tripping over the dog and almost running into a wall.
I recently watched Ready Player One (good, but not as good as the book) and they had a similar device, which looked (and looks) awesome. I'm sure this will have far more use-cases than playing games, but the example shown looks so cool.
And this is the "mini". I'm sure there must be a "full-size" too. I'm not in the market, but I'd imagine they're crazy prices, and insanely crazy for the larger version.
Great hunting