Room-scale boundaries allow for the most immersive form of virtual reality today. An important component for this to work is to have something tell you when you're about to run into a wall or other physical objects. Otherwise there our huge safety issues.

The Vive is pretty well synonymous with the term room-scale VR, allowing you to roam freely around your physical space. You are only limited by the size of the room you are in. The Vive provides a Chaperone which pops up a virtual wall identifying the end of your assigned vr space.

Oculus Touch has it's own Chaperone on the way that they're calling Guardian. It's set to be released on the next SDK update.

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Designed from the ground up for immersive, room-scale virtual reality, Vive lets you experience new, unimaginable worlds thanks to game-changing technology and best-in-class content. Everything from games and education to medical and design–believe the hype, get excited and see for yourself what everyone’s raging about.

Rift is unlike anything you’ve ever experienced. Whether you’re stepping into your favorite game, watching an immersive VR movie, jumping to a destination on the other side of the world, or just spending time with friends in VR, you’ll feel like you’re really there.

Redefine your expectations of immersion in gaming with moments so intense your intuition takes over. Step into incredible virtual worlds and experience entertainment in new and extraordinary ways with the PlayStation VR.

With the Samsung Gear VR, you can play amazing games, watch Hollywood’s best movies in your own private cinema (or even on the moon!), socialize with friends new and old, be at the center of a suspense thriller, and so much more. The Gear VR drops you right into the action.