I really like it, but
The main thing I would want is bluetooth/wireless connectivity.
Imagine a media centre and screen that you have on the far side of the room, and a you're working at a kitchen which is messy. this would be an excellent control system to point at a surface (e.g. kitchen) and you could just control things remotely. I'd not want to string a cable that far. So long as it had both battery power and powered via the USB/HDMI cable that seems to be used, this would be excellent.
Another use case would be lounging around on the sofa with said aforementioned Media centre, and not wanting to use a remote keyboard.