The demos are quiet nice, indeed. Though, I ran the really well done http://www.chaostoperfection.com/ - walkthrough and it stutters on my machine for whatever reasons. So it was not that convincing at all for that tech.

What I find disturbing is this "I run in the webbrowser" attitude which has sort of a non-immersive nature. Even though you have this great tech, as long as I see a surrounding website, or, a surrounding browser.. it feels not complete. It is more a gadget to a website. It feels not like a game. A game should always run fullscreen (in my opinion). Maybe this is highly subjective but I always think when a game has "additional clutter" to it it feels weak.