vorpX isn’t really beta or early access except for the new Vive support. There are dozens of YouTube videos showing what it does.
Tracking support depends on the game. vorpX has two different 3D modes, which has an impact on head tracking. Many games support both, others only one of them. G3D (best looking stereo 3d, but slow) allows rotational and positional tracking, which means you can lean forward, sideways etc. Z3D (fast, but stereo 3d not as good) is rotational only. Head tilt always works.
Stereo 3D can be disabled in all cases if needed.