Athlonite: just as a further question does Chorus use G.Vector
Not that I'm aware of. Australia's NBN FTTN uses VDSL2 with vectoring, and if your modem doesn't support vectoring you won't get sync at all. I think with vectoring, all the CPEs need to support it or it doesn't work.
Given the UFB rollout plans to cover most (if not all) of the VDSL coverage, I can't see the point in upgrading to support vectoring.