Well I happen to think that sphere3d is a 3d environment, more so that what I saw of that video. I could move around in it, this to me is more freedom, much more realistic than 3d looking windows.

3d effects slapped on top of 2d designed applications is not 3d enough for me, I want to tuck my folders behind trees and pluck leaves to commence tasks, like using leaves as stikkies for example.

This is what sphere3d is for me, maybe you are concerned about performance and spreading it over two screens, fair enough, but for me its the exploration of a 3d desktop environment that gets me salivating.