I was just left Navigator on 12/17. They have installed the new flat screen TVs. The spa was nice with great service (though not terrific prices). I found the ship felt full compared to the larger Voyager, but service was more personal in the restaurants.
I did have some minor issues with my cabin that should have not been there after dry dock, but overall, I really enjoyed the cruise, and they went out of their way to give us good food, good entertainment, and a good time.
I would not want an aft cabin on this cruise. What they say about the vibration back there is true, but I had a very midship cabin and did not experience anything there, only at the lounges.