Celebrity offers excellent service and great food.
I have booked Concierge class for our last five cruise on Celebrity. There are a few other perks associated with Concierge class such as extra fluffy towels and robes.
You should try it once. I think that you will like it.
Carnival Liberty New Year's Eve 2007
Liberty of the Seas 5/2008+11/2009
Allure 1/16/ 2011
Vision OTS 2-14-2015
Freedom OTS 3/6/16