Can you walk around, walk away and come back? How much movement is allowed before experience breaks down? This is the major difference between VR devices like Occulus/Cardboard vs Hololens.
It's on an HTC Vive so you're tethered to a PC with USB cables, but you have about a 15ft by 15ft square to move around in.
Bandwidth, power, weight, cost, combination of all?