So, I was for a long time on MTNL ADSL Broadband, before switching to excitel.
For a couple of years, initially, I was using the router provided by MTNL along with the connection. Good part if you accept their router you dont have to pay anything, not even security, but here is the catch you would be charged a rental of Rs 60-70 approx per month(rent for 2012-13, might have changed).
So after using it I felt like im doing injustice to myself by paying for it. I returned their modem back and bought the D-link DSL-2750U(for around Rs 2000). A piece of advice, D-link makes the best available routers out there. Having double antenna was definitely a plus. A myth surrounded to this multi antenna models is that it doubles the range, but as I said that’s a myth. Yes it does increase the range but only about 20%. Advantage of double antenna is that one of it serve for catching command, that is the one you send to the server from your device, while the other sends it to the device from the server. This reduces load on the antenna and thus provide better efficiency.
Range was quite good my whole house was being covered(it was placed in the center of the house). I could use my net a floor above and below too. So all in all this router is very comprehensive one with fact that it has WPS and a USB port, in which you can connect your storage devuce and use it as a cloud.If you are having an ADSL connection, likes of BSNL, MTNL, Airtel, then this router is a for sure device for you.
Hope you found this helpful.