Best answer: The HP Reverb G2 VR head-mounted display (HMD) includes two redesigned Windows Mixed Reality motion controllers. Despite being designed with help from Valve, the Reverb G2 will not work with Valve's "Knuckles" motion controllers without some significant work.Brand new HP VR: HP Reverb G2 ($600 at HP)Premium motion controllers: Valve Index Controllers ($279 at Steam)