Part of a larger group of friends, we were a family of four split between a Haven-class suite and an inside cabin, so we experienced the gamut of what NCL has to offer on these brand-new ships.
For this review, I'm holding the Haven class experience to what you might get on Crystal or Regent or Queen Mary Princess class, because the Haven class pushes the fares closer to luxury.
First the highs:
Excellent option--spacious, nice jacuzzi. Only hassle is you have to go up a deck to enter Haven.