We did a few Norwegian cruises in the past and enjoyed them very much.
At the time we got great deals on suites, they included a specialty dining package so our meals in the main dining room were few. I admit that the worst meal I've ever had on a cruise ship was in the main dining room on a Norwegian ship. However, I really enjoy their specialty restaurants.
Recently, though, their suite prices are through the roof. And they don't ever go down. If they're not selling they do that bidding thing that Celebrity has started also. In Norwegian's case (don't know if it's true of X), only select people are allowed to bid.
Their Haven restaurant is supposed to be great. Better than Luminae. However, it's the same menu every night.
Some of their suites are very large which leads to a lot of kids in the Haven.
I've read too many reviews where people can't enjoy the pool area in Haven because of this.
If I could find a great deal on a Haven suite, at the right time of year, I'd like to try them again.