I am using Tata Sky from 6 months. I have subscribed for HD channels pack as mine is a HD TV. HD pack(100 Rs. per month) covers 10-12 channels and the bad thing is you need to pay for the normal channel also. That means, if you want ESPN HD channel, you need to pay for ESPN normal channel also.
Then only you can see the channel in HD quality. Who on the earth will see normal channel, if HD is available? Why the hell, someone should pay for normal as well as the HD channel? Also, from this month, they have suddenly increased Star Cricket channel monthly charge from 25 to 40(Star cricket is also available in HD).
The worst thing is, once they increase the price, it will be locked for 1 month. You have to pay for the channel for a month. Later you can drop it based on your needs. This is nothing but cheating people. Clarity wise, Tata sky is good. But, price wise it is horrible. I wont recommend Tata Sky for anyone.