It is being used in Lower Hutt, with full signal. If anyone has done tests in Lower Hutt it would be great to compare! I will endeavour to add some pics of the tests tonight.
DrCheese: I noticed very slow speeds on XT with my iPhone 3GS on August 14, the date you posted your message. Download speeds are back up to around 2-3 Mbps now (at least in Dunedin) on August 15. Maybe the network was taking a nap on Friday.
antbs: Did you try rebooting the phone in order to recycle the network connection?
Paulthagerous: I have since tried a server in both Christchurch and Napier. It is much faster on the wifi (about 2500kb/s down 500 up), but still only just hits 1000kb/s on 3G.
NealR: 1-1.5Mbps down and 70-100kbps up is about what I get on my iPhone 3G (2.2.1) I've gotten ~2Mbps down a couple of times but it is not common.