I have been on 6! My family and I are addicted to them:)
I have been on Royal, Princess when it still existed, Norweigan, Carnival.
Carnival is the best! There is so much to do!!! My fi and I are young so when we go on a cruise we want to have a blast and meet new people! I also like carnival because you dress up for dinner and you have an assigned seat for dinner for your entire cruise also you get to sit with other couples! It is a great way to meet new people and find out about what everyone else did. Our last cruise we met a newlywed couple that were on their honeymoon we are still friends and talk often on myspace!!!