This is great feature except if you have multiple monitors. Areo Snap won't snap correctly to the part of the screen that goes across your monitors.
You can work round this by holding down the windows key and pressing the arrow key for the direction you would like to snap in (e.g. if your window is on monitor 1 then press the start key and right and will will snap to the right part of monitor 1)
P.S. Also don't forget you can press the start key up to maximize, down to minimize and you can use the number keys to select items from the start bar to maximize them (or bring them to the foreground)