We didn't take any on our last cruise but sure wished we had them when our family got separated one evening after dinner. We spent almost 1 hour looking for each other walking around in circles, and on the Legend, that is one, heck of a big circle!
RCCL, 1992, 3 days, Empress of the Seas
CCL, 1997, 7 days, Celebration
CCL, 2007, 7 days, Legend (first family cruise)