If you don't mind waiting on hold for an hour each time you call, which is what I have done, then they are alright. Had a little problem with them. I booked thru
DCL, and then switched over. Booked last May, then wanted to add another DD, a college girl who we decide would be too sad if we all went without her, tried to add her. Costco said NO at first, and then when I fought long and hard, said we could add her but pay almost double for just added 1 girl.... She wouldn't even budge, so I asked her to please call Disney for me.. she was rude and snotty, and wouldn't do it, So I finally threw a FIT to have them call Disney for me, well........ who was surprised. DD got added with cost of course, but NOT double. The Costco TA was angry I know that
Disney Cruise lines let me, but I worked for Disney Stores for over 10 years, I know how Disney is... And they are much better than Costco. So... would I book with them again... To save a few $$$, well, if you don't need them for anything else, no guest service at all, go ahead, but ME.... I will have to save an awful lot to go with them again...