"Arrange your application windows using nothing but drag and drop! There are no hot-keys to remember or menus to click, just drag and drop a window onto Layout Icon and it will instantly snap to that layout."
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Pro Allows multiple workspace configurations
Not just window sizes, they are multiple precisely sized windows that fit together to fill up the screen.
Pro Fine tune window sizes
You can set up windows to fit as large or as small of an area on your screen as you would like. For example if you want a 1/3 left, 1/3, center, 1/9 top right, 1/9 center right, and 1/9 bottom right you can and it is easy to set up.
Pro Easy drag and drop interface
When you want to resize a window you just drag it on the screen, your configured workspaces appear semi transparent immediately, and the you just drag and drop your window above the configuration that you want to use.
Con Workspaces don't show up when you drag a window
Workspaces will only appear on one desktop, but not the others.