How this relates to real world speeds is unknown but would expect at least half that. So either 2degrees haven't enabled HSPA+ yet as they appear to be in a testing phase, or whats probably more likely is that 2degrees just don't have the transmission capacity to their sites, as most of the sites I've driven past are using Microwave Links, similar to vodafone, where as telecom have fibre and unlimted capacity, microwvae links are very limited and could be somewhere between 34Mbit/s (16x2E1 PDH) or 155Mbit/s (STM-1 SDH).
I recall reading somewhere that the majority of their sites in CHC are connected via fiber due to a deal 2degrees made with a local fiber company.
In AKL it seems to be a mixture -- I know of several sites which don't have microwave links so must be fed by fiber. One site for example is co-located with Telecom so 2degrees might be sharing their fiber link.
Not sure of WLG but I guess slightly more fiber due to the geography not being suited to microwave links.
- James