I have been using this for almost three months now, and have gotten to the point where I no longer can live without it. I currently have 7 different desktops for graphics, audio, web development, etc. and although it sounds like overkill, once you get used to working with this app, things are way more efficient.

It's loaded with features and the transitions to choose when switching desktops are simply jaw dropping. It is fast and extremely customizable.

I do second the opinion of a previous poster on being able to move windows to other desktops in an easier fasion. And one feature I would absolutely love, would be to only show the active apps of a specific desktop on the dock.