I have the Viture Pro which is similar, but the trouble I've always had with display glasses like that is that having the display fixed to the center of your field of view feels very unnatural. They have all the sensors to support 3DoF tracking, but you need some (usually proprietary) software on the host device to enable that.

Still, if support for that becomes more standardized and the FoV gets better, I do think this category of displays is pretty exciting. I've found them useful despite those drawbacks!