I wouldn't fool with it. As with most things such as this, there will be a catch at some point and deals that sound too good to be true usually are. Google cruisepoints and see. It appears handing out these cards for "up to $600" is a common thing at Columbian Emeralds as a way to close a sale. And looking at their website, this isn't $600 off a cruise. It is up to $600 worth of "cruise points" since you have to book your cruise through them.