When donning a VR headset, it's easy to be awestruck by whatever 3D world you find yourself in. It's a whole new medium that simply can't be replicated on a TV. Still, there are reasons the likes of Oculus and Sony aren't selling headsets to the masses just yet. While Samsung's Gear VR and other smartphone-powered headwear are filling the void, headsets that tap into the processing might of PCs and consoles will ultimately deliver the most immersive experiences. But, the technology isn't quite there yet. Stereoscopic 3D can be jarring, with complicated worlds often appearing slightly out of focus. Then there are issues like nausea that can strike when moving through virtual surroundings. Also, how we interact with virtual spaces will continue to evolve, moving beyond the gamepad and keyboard to more natural and hopefully intuitive methods of control.