I am a bsnl Sim user for almost 8 years now and so far I have experienced either only ol services or the worst ones when I used the BSNL Internet or the broadband services the story is same in both sides. Both have the connectivity and speed issues.
No doubt bsnl is the best cheapest Internet service provider but its doesn't me as its provides the best services also. I have used 2g networks also and that too is not impressive the E signal keeps on dropping most of the time even on data pack enabled and when I switch to 3G there is no network at all and when you get a signal there is a 3G sign on the bard but speed is just 23kbps only in H signal you get some speed but that too doesn't last long very much and is inconsistent.
I really liked the fact of cheap data plans but what am I supposed to do with it if it doesn't provide me the network to begin with and no connectivity. So far experience has been just going down and the rates up and that is something I won't recommend to use.