Today’s VR headsets are marvels of miniaturization. And, as iFixit’s teardowns show, both the Oculus Rift and HTC’s Vive are also remarkably user-friendly when it comes to repair and customization.

Most relevant is the room-level motion tracking system. The Oculus headset, as you may know, is studded with infrared LEDs that are tracked by a system of cameras. The Vive flips the script, with the detectors in the headset and the IR pattern being blasted out by a pair of laser-spewing “Lighthouses.”
This reversed tracking technique (or perhaps it is Oculus that is reversed) has advantages, but also disadvantages — not least of which is needing to house the electronics necessary to run a set of 32 IR detectors rather than just LEDs.
When you’re as weight- and space-limited as the designers were for these headsets, that’s a significant consideration. Needless to say, HTC and Valve’s engineers rose to the occasion, however, as the Vive is just as, if not more light and comfortable than the Oculus.
The lens system is also different; Oculus opted for a fancy asymmetrical fresnel lens to allow users to adjust the image by pushing the headset up or down on the face (this also saves space), while the Vive went for a more ordinary distance-adjustment technique with an apparently symmetrical fresnel lens arrangement.
iFixit notes that the whole headset can be disassembled with pretty basic tools and without any irreversible damage like snipping ribbons or breaking seals. That’s good news, because early adopters are definitely the type to take things apart and mod them. Expect to see some crazy battery packs, adjustments for hardcore glasses wearers, and so on.
