We were on the Costa Victoria July 2007 my wife and i bought the X1 prior to cruise the cost was £90 pounds for two.
It gave you unlimited wine ,beer,spirits,soft drinks or water by the glass during meals,however that started with lunch 11.30am untill 4pm,the evening meals started at 5pm to midnight.
we did not bother geting one for our daughter as we just ordered her drinks on our card.
The waiter takes your card away and swipe it,a good tip always tel them to buy one for there self
that way you get great service and doint have to wait long to order as they always look out for you.
We must have saved hundreds of pounds on drinks.
Costa have just quoted me £115.57 per person for the X1 package on a 15 night cruise to the far east, this can only be used at lunch and dinner in the main restaurant.