cheap.. yes.. but what if more HD channels are added during the year. Then u will have to subscribe to them individually which will result in paying higher. So one has to be careful with these 12M or 6M topups.
If it had been like 1 year topup for Rs. 4.70 DBR (1750/365), then it would have been a nice offer, since u can discontinue anytime. But in this case u have to pay 1750 upfront.