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The first benefit is cleaning the outside pane of glass from the outside; the other is allowing larger opening vents than side-hung or top-hung windows. 

Top swing reversible windows are also mainly used in high-rise buildings, but they could be worth considering for the home. Essentially, these operate in precisely the same way as top-hung casement windows, but they use a very sophisticated friction-stay mechanism. The window is opened to its normal opening position and then stops as a standard opened window.  Upon releasing a catch on the friction stays, the window continues to open out still further and reverses back on itself, bringing the outside pane to the inside.