Experience with HDFC Cards has been good. Have never looked at the interest option since i’ve always paid the outstanding amount by the due date. Was charged a penalty a couple of times when I paid the outstanding a couple of days after the due date ( had not even paid the minimum amount by the due date, owing to travel)
But the same was reversed after a detailed email to HDFC Cards requesting for the same, in light of good payment track record except for the 2 instances. On the rewards front, HDFC Bank does not have a very good rewards scheme as compared to others. But customer service is excellent. They also have two billing cycles, one on the 25th and the other on the 5th and allow customers to choose any one of them. This is useful for those who already have a card and choose a second to make optimum usage and take advantage of the alternate billing cycles.