I have been using Sify Broadband for the past 2 years and I have nearly no complaints. This connection in my locality(Behind IIM Bangalore) is provided directly by Sify and hence no 3rd party or cable operators. May be because of that the connect reliability and speed has been pretty good. I have taken the 256 Kbps night unlimited range.
So far I have been getting around 200 Kbps on average and renewing my account online. Whenever I face trouble I call up the Sify call center and the try to fix stuff by the next day.
After seeing the whole lot of comments here in this forum, I think I’m one among the luckiest(touch wood / touch hood).
I once had serious trouble with their online billing though, that is one thing that sucked majorly but thankfully it got resolved. The online chat facility is really bad and those guys(esp at night) are nearly sleepy and hardly pay any attention to what you are telling them. But the call center number(if you are lucky to get through) seem more responsive