Im happy to recommend DNA - and have had 2x cars (Mk6 Golf R and Mk6 GTI) tuned by them. I know DNA can tune the Mk7 GTI (so im assuming the Mk3 vRS too) in Europe, but im not sure if the Aussie dealer has the updated tools/software to do them.
I had a crappy experience with Bluefin on my Golf R - good response time and support (faster than DNA) from their tech team but crappy tune despite multiple revisions. Car ran like a dog and used heaps of fuel. Changed to DNA and the car came alive again.
Another option to add to your shortlist would be SpecTune from Tarmac Engineering in QLD. They use the same hand controller (Alientech controller) that DNA use and i believe they have tuned a few Mk7's.
Im not 100%, but pretty certain that your ECU will need to be removed and physically opened up to read your stock file and upload the 1st tune. Once the ECU has been unlocked, then you can tune/remove tune with the hand controller. This was the case with my Mk6 GTI and i know ECU security is only getting better. I believe APR are the only ones who can get around this without removing the ECU, but you will have to sell your kidney to pay for it.
Another 2x options for you in Sydney to look into - ETuners and Recode/Port Hacking Automotive. Mark from Recode/Port Hacking Automotive has some of the fastest modern VW's in the country and does custom tunes (he is also a reseller for Bluefin for those wanting a cheaper tune). ETuners are only reasonably new here in Aust but have been around for a while in Europe etc.
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