Thanks for the input, I received some more info this morning after this post. I understand that it costs around R1000 more for a 512K than the IS 512K offering (R2700 plus). Also heard that the international ping times were no more than 250ms (low latency) - so it is obviously unshaped and does not run over satellite. Their website claims they have SLAs, and redundant links.
All in all, I think for the price, it is worth spending the extra ca$h when your livelihood / business depends on it. Although I still have a HUGE problem paying more for internet, than I currently pay for a luxury SUV per month in the US. South Africa needs to get on board with where the world is headed with broadband.