detonate: This is why your iSky doesn't work well on Telstraclear:
Every other ISP in New Zealand gets iSky delivered in, mostly, Auckland. (There are nodes in Wellington and Christchurch too)
Telstraclear gets iSky from Los Angeles.
I would note that that article is almost 8 years old. So I think it's a bit hard to say if that is still relevant?
Maybe someone at TCL can comment?
Also, not sure that explains why users on other ISPs than TCL also experience buffering issues?