Hi,
Myself Nithin and from 2years I am using bsnl broadband and I have a 4 mpbs connection which is unlimited and I always and every time, every day, even on weekends like saturday and sundys get a speed of 3.45mpbs out of 4 and tat always impresses me of bsnl broadband .and yes one of the reason for others to get less speed might be because bsnl dns server is very slow hence if u r having speed issues please change the dns server to google dns server tat is 8.8.8.8 tat will do the job for you.