I thought "what a nice wind sound effect" until I realized it was the CPU fan in my laptop. Heh. But that's not really a big deal, at least for now, and I'm sure you can optimize.
Experiments like this show us that graphics and VFX are overrated. It's true for games, and it's true for movies too. Primer is still one of the best sci-fi flicks I've seen in the last ten years, and they used what looked like surplus air conditioning equipment as props. Sometimes too much FX actually gets in the way of your imagination. When I visit a virtual world, I kind of want it to be unlike the physical.
I tried a Rift the other day too, and that has its appeal as well. But it's a different appeal.
Noticed it was a tad laggy and then tracerouted and found that it's in London and I'm in Southern California. I suppose that's understandable. I guess if things take off you'd be able to geo-locate a bit via other cloud services.