The plans in bsnl broadband are nice and they are giving the prescribed speed and bandwidth nicely. The main problem is their sudden drop in speed which is very bad . It is not helpfull in work that needs constant high speed. For eg if you want to download 1gb file normally it take 2 to 3 hrs if speed is 100 to 200 kbps or according to your plan due to sudden drop in speed the download time is increased to 1 one day which is bad.
Sometime the whole connection drops and it takes large time to come back to normal or you have to call for service.
Overall bsnl broadband is trending due to its cheap rates then other broadband service providers.