Hurricane is best used on champions who have on hit effects that affect their kits very much. in other words dont bother with hurricane if the only bonus its giving is just doing an extra 2 shots with no other bonuses.
http://leagueoflegends.wikia.com/wik...%27s_Hurricane that link will have a list of items and abilities that will be affected by this item and also how it is affected by this item.
Vayne is one of 2 champions that does not work well with and actually ruins them because their ability requires the champion to hit only 1 target. so silver bolts is actually disabled on the 2 extra shots. and on vayne this item just does 2 extra basic attacks with any on hit abilities from her items.
same thing applies with orianna since again she must hit the same target in order to get stacking buffs, but unlike vayne, this isnt disabled thus she'll never get the increased damage for each shot.
the champions I would make this item a core item on would be: Caitlynn, Twisted Fate, teemo, corki, Kennen, twitch, and varus, everyone else would be situational and wont provide as much as these guys.
the reason is for Caitlynn, twsited fate, and kennen is because it causes their charged shots to go from 1 every 5-7 shots to every shot or every other shot.
twitch and varus will be able to apply their passive debuff to multiple targets which will also affect their other abilities to do massive damage.
and for teemo and corki, these guys have a scaling damage bonus on each auto attack that now can be hit on multiple targets.
of course if your playing a ranged champion who is building heavily with on hit items such as blade of the ruined king, malady, or wit's end, you'll see a good boost in damage from this item as well.