When boarding the Jewel of the Seas, you are first stuck that the ship is different from most. The deck plans do not follow the usual "cookie cutter" pattern most ships have. The main elevator area is along the port side, not in the middle, etc. The layout works. Though the ship was fully booked, it never felt crowded. There were never significant lines for anything. The decor is overall muted. None of the glitz or whorehouse red that tends to dominate ships. Just an muted elegance. The staff was generally excellent.
The food was quite good, particularly in the main dining room. The buffet had fewer selections that a lot of ships I've been on, but they were generally good. And, unlike most of my recent cruises, there were always plenty of tables available, including an outside area that was unlike any I've ever seen. There were, however, only two specialty restaurants and the Portofino had lackluster service, though good food.
The fitness center had a large number of aerobic machines, far more than most larger ships.
An additional benefit as far as we were concerned was the smoking policy. NO SMOKING ON BALCONIES. I've had cruises where nearby cigar smokers made the balcony useless to us. On deck smoking was limited in area. On the pool deck there was only a small aft area along the starboard side for smokers , not an entire side.
The downside was the wasted money on the "Junior suite". The suite was 1.5 times the size of a regular cabin and 1.5 times the cost. While this may seem fair, this ignores the other costs per passenger for food, entertainment, etc (i.e., the extra charges for an extra person in the room). And there were no "perks". None. Zero. Nada. Our first experience with the suite class was on another line where that was the only choice left for the cruise we wanted. It was not much more in cost than a balcony cabin, but teh suite was huge. There was a concierge who kept in touch and was always willing to help (like for reservations for sold out specialty restaurants or excursions). We had our own area for breakfast and lunch. We had special treats delivered each afternoon. We had our own cell phones, DVD players, etc. Huge bathroom with double vanities, etc. Plus, we were treated like royalty on checkin and personally escorted to our room. A "Royal" Junior suite was just an expensive room.