The site is remarkable, but undoes so much of its developers' hard work through its sluggishness. My maxed-out Haswell 15" hit 9fps during rapid scrolling in Chrome (FPS counted by dev tools).
Hopefully they're less tolerant of poor framerates in their actual product, which sounds very exciting.
I fear for the people who use these devices in production. IIRC, over-eye VR displays cause nausea even with a relatively low latency (~20 ms[citation needed]), which was one of the reasons why Glass went for the "above the field of view and on one eye" approach. I'm not even sure if it's possible for consumer hardware available today to process/draw fast enough to make users not nauseous, wearable form factor or otherwise.
Hopefully they're less tolerant of poor framerates in their actual product, which sounds very exciting.