Google and another company have a tool to check if your isp is speed limiting bit torrent. go here:
http://www.measurementlab.net/measurement-lab-tools.html
Do the test. Then we will make a list of nz isps that speed limit bit torrent so we know which isp/s not to join or to leave.
eg.
xtra throttle
orcon no throttle
slingshot throttle
etc
etc