Well all cards have same feature of swipe and buy items,
one wierd thing or depending on your use could be a boon or curse.
once the credit limit crosses, sc allows for extra purchase power but with a high fees.
recently I was unaware of my expenses bought a high value item which crossed my credit limit. sc allowed but with a+5000rs limit cross they put a fee of 500rs and gst 100rs.
however this will not happen in case of icici or hdfc. one cannot cross the limit and will show error while purchasing. also icici or hdfc have option of setting user choice limit to restrict excess expenses. this simple feature also sc doesnt have.