My wife and I (early 30's) sailed on the Valor October 10-17, 2010. Due to Hurricane Paula, the ship changed itineraries after Grand Cayman. Instead of Roatan, Belize, and Cozumel, we went to Ocho Rios, Jamaica and Nassau, Bahamas. Since our sailing was not typical I will limit this review to Grand Cayman and my overall impressions of the ship.
We have cruised twice before, once on Carnival (10 years ago) and once on the Norwegian Star (last year). While we don't dislike Carnival, we both agreed that NCL was just nicer overall.
Getting to the Port of Miami:
Thin walls. Located directly above the casino. Loud.