none so far, internet is like you have it and you don't have it, nothing can be done which requires real time applications and your bread and butter depends on it, like stock market or foreign exchange trading, VOIP communications for business purposes etc.
up time of internet is flaky and not up to the par to use it for real time applications
if you just want for personal use, emails browsing, downloading torrents etc for this its ok
customer service is worst, incompetent 3rd rate talent employees
worldcall is available in middle to upper class areas
ptcl dsl is widely available even it covers poor areas
maxcom dsl again like worldcall cater to middle to upper class areas.
ldn and wateen forget about them they are just outright worst.
there is another rip off internet joint called cyber net f@## them