Hi Andrew! I bought mine from Barbagallo Mandurah too I decided to go with them for my 15k a couple of weeks ago because I work in Mandurah and going up to Perth would involve taking a leave day. I was happy with it and was charged $418. Matthew gave me the remaining VW window cleaning fluid bottle and I got a courtesy car for the morning.
I'll probably stick with them unless given a reason not to in the future.