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Not spending real cash in the cash shop so I can't test it out. Can someone post a vid or something of what it does? If it skips the finish animation that leaves you vulnerable that would be overpowered, which is why I bring it up. Of course, it could just be the option of dropping a cow instead of a flag, but still I'm not spending real cash to find out. Also, I would take a print screen of the item description, but Arenanet doesn't allow us to take screenshots of tool-tip popups anymore, how quaint.
The description reads "When activated, your character will drop a cow on your enemies to finish them in PvP and WvW. Last for one hour." 75 gems for one.