For speedtest.net servers, within NZ it basically doesn't matter how far away they are... I can see all the results on our three servers and gigatown customers get (basically) the same speeds to our Chch, Wgtn and Akl speedtest.net servers..
Interesting to know - I recollected differently but stand corrected.
For me (and I suspect most people) Giga internet is a shiny new toy that you want to push as hard as you can to start with. At this stage the speedtest numbers are very important.
Then you get used to it, it becomes normal and realize that the rest of the internet is the next bottleneck :).
Finally you enjoy the fact that two tenageers can't hog the bandwidth no matter how hard they try.
When the Dunedin prices go up for Gigatown I will no doubt change down to slower cheaper plan, but hey - for now its nice to have.