We booked our third HAL cruise directly with them. Didn't know anything about CO, but after the reps explanation, I decided to purchase this option. It worked in our favour and we were able to move from a VH Cat to V (which is the cabin we wanted). Cost of CO was included in the total price, but had to be paid, at time of deposit, which was fine. This saved us approx $800 CDN for a 17 day cruise.