I have been using SBI credit card from last couple of years. The best part of SBI service which I like is Payment TAT; wherein other banks take approximately 3 days to credit the payment that are paid through billdesk ( online) , SBI credits it immediately. I have been using 7 different bank cards. I havent seen such a quick credit option in any other bank.
It is not only about SIGNATURE card, this feature is applicable to every card from SBI.
The rewards we earn on purchases usuallt equivalent to 25 paisa. If they increase it, it would be great.