Its the CANBus gateway that you are referring to. It needs to be a minimum revision in order to prevent a potential battery drain issue whilst the car is off.
See Upgrading 2nd generation radios (RCD 300, RCD 500) to 3rd generation (RCD 210, RCD 310, RNS 310, RCD 510) power drain issue | my-gti.com
Is it worth it? Very subjective, has been discussed to death all over the interwebs. Totally your decision.
I'm sure there is someone in Melbourne who can help you out with install for a slab. There may be a few Melbournians left don't who only drink fair trade organic lattes![]()
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