Booked online because it advertised better discounts however: 1) it wouldn’t allow me to book 2 cabins at the same time so I had to use 2 computers to process bookings at the same time. 2) cruise 118 class under 16 as children however Celebrity class under 11 as children therefore got all the way with online entries on both computers and then tried to put 15 year old child in and Celebrity refused to accept the entry because they class that as adult. Therefore had to start all over again. 3) Due to the above the booking online took me 2 hours rather than 1 hour as I had to wait for the selected cabins to be released again. 4) in the past I have booked over the phone and this was ok but because of pricing discounts for online bookings tried that.