Using is Since 7 years with my Hall Television.
I haven't upgraded it to HD yet but Tryied airtel HD at my friend's home and now planning to upgrade it.
The Set Top Box provided by Airtel is of very good Quality because I am using the same set top box from 7 years which has airtel's old logo and nothing happened To it so far.
Plans and packs are also in budget and overall very setisfied with the service.