I have used Airtel DTH HD for over 2 years.
Advantages:
1. Movie channels like Star movies, Zee studio, movies now are really good.
2. National geographic , discovery are good.
3. Enjoyed Sony Six watching World Cup. It is superb.
4. Service is quite good.
Disadvantage:
1. Problem with Airtel is they wont inform when they change rates of channels and your balance goes to zero without your knowledge.
2. Pictures seem stretched for hindi channels such as Sony, star TV.
3. Colors is repeat channel, all programs are repeats, same holds good for Sony and star plus including Zee TV.
3. Even Zee cinema images appeared stretched.