I probably wouldn't use them in any form for what they want to do with them, not a fan of plugging in that hard, but I could wear them for extended periods of time no problem. Can play video games with the big bulky Valve Index for hours on end without a break, I doubt this AR set is much heavier or hotter. Any sort of exercise would probably make it way too steamy to be reliable though.
Would be cool to get some sort of advanced vision system to augment my poor vision though. Start looking like I'm from Star Trek with that sweet visor.