Chi-X now known as Cboe. This might be old news, but I only just heard of it.
"Cboe is a day-only trading exchange. Orders can’t be left overnight. This may make it faster to execute orders compared to the ASX (as there can be less backlog of other orders to compete with).
Cboe has unique exchange traded funds (ETFs) and managed funds that aren’t available on the ASX.
Unlike the ASX, Cboe does not operate an opening and closing auction".