The quality of Princess is significantly better than Carnival. My wife and I have gone on 11 cruises; two with Carnival, 4 with Princess. The added cost of Princess is well worth it, when the alternative is Carnival. We have sailed most mainstream lines, and the only line I dont recomend is Carnival; not because Carnival is that bad, but the others (particularily Princess and Holland) are just distinctively better by comparison. In my opinion, Princess is better in every critical aspect. Thus, if you have been satisfied with Carnival, you will love princess.