I guess the only problem with Airtel BB is FUP.
I too want to switch from BSNL. But cant decide which provider should I move.
Actually Im looking for 1mbps TRUE UL Plan(No FUP).
BSNL have 1mbps Plan but charge is too high.
Cable Broadband offers 1mbps Plan on 999/- or something like that, but not reliable. Heard that Cable Broadband starts becoming an issue on Rainy days or on little Thunderstorms.
Reliance is there, with decent plan but people suggests its not reliable.
And finally Airtel has FUP on all plans