I am Airtel Digital TV customer. This is my experience with Airtel.
Airtel is good for :-
Quality of STB + Remote
User interface
Fast software
Good Picture & Sound quality
Good Reception even in medium RAIN.
Airtel is Bad for :
Installation engineer are not that qualified. (They are on contract.)
Few Customer care guys are not helpful.
I will suggest you to go for it. I Love it.
Regards,
Anubhav Ranjan
(Delhi NCR)