Before you dash out and buy WindowMizer (since there's no demo), you should be aware of several matters. First, it's not going to give you the Unsanity experience. Windows do not merely collapse; the collapsing is always preceeded by the screen going completely to black and then returning with your minimized window. (I was tempted to shout "ta dah!" when it happened.) Second, the command keys do not always work. Although I can windowshade when double clicking the toolbar, I have yet to find any key combo that will windowshade. The "restore" key works okay, though. (However, Unsanity allowed the exact same key combo to windowshade and unwindowshade.) Also, any key combo I tried that involved the letter "M" minimized the window to the dock. Finally, if you use any kind of program that modifies the screen color, etc. (such as RedScreen), WindowMizer will shut it off or otherwise override it.
In short, the program is far from the elegance you experienced with Unsanity. At the same time, I recognize that it's in its infancy and could perhaps overcome these problems. That's why I'm opting to comment instead of rating it at this time.