I know there are alternate views out there, but my wife and I drank soda because we found the tea to be an instant mix, and not up to par. We got the cards and two cool little coke glasses that we still have and still use. We went on the Star in June of last year.
If you go on one of the Hawaii trips the soda card is a lifesaver on Fanning Island where the price of soda escalates once you get there. I don't drink alcohol so the soda card was a terrific bargain for me.
Hope that helps
A. L. DeWitt