Island's hidden orders

Island allows to post hidden (non-displayed, "iceberg") orders that do not appear on the limit order book. I can see a large amount of those executed for QQQ, for example (apparently somebody using them a lot). Do these orders provide any real advantage for traders and if so, in what situations? Thanks,
 
yes, there can be a big advantage - same way the institutions use the reserve book for redi/arca and inca. point is - you don't have to show your hand.
 
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