IDFC has been giving CC users this offer for some time now. I got the account under the offer last year. Then there was no autopay condition attached.
The account is good for netbanking transactions including IMPS that is free. They also offer decent above if not the best interest rates on FD. Used to have attractive savings account interest rates but not any more, with unrealistic slabs.
But if you are planning to use the account for UPI transactions, particularly UPI-In, then think again, your account can be put on freeze any time without any warning, and then you'll have to go to the branch to try and get it fixed. UPI Out is mostly OK. So decent as a back-up account that can give you good FD interests and offer you realtime free netbanking transactions.