They are illegal (at least in vic) unless you have self leveling headlights, and washers for the headlights.
They are very nice though.
There is one loop hole to this (found out from the Phillips rep)
You can have HID's if you have two of the same type of light (I can't imagine that makes too much sense so..........) Like in say an XR6 or Territory when you have the Hi/Lo beam as a H4 globe then another high beam as a H7 you are technically allowed to upgrade the H7 to high beam.
Sorry if my wording is incorrect I just cant think of what he called it for the life of me.