My own, SteamVR compatible VR headset.
You can play on it anything that is on SteamVR.
It uses 5.5" MIPI display at 2560x1440 resolution which makes the image very nice and crisp.
It uses HadesVR HMD PCB and PSMoveServiceEX for full 6DoF tracking.
You can move around your room with this thing on and it will track where you are standing.
Rear of the Headband is not super comfortable but it will keep the headset on your head.